62 Best Outlook OST Viewer Tools (2024) [FREE DOWNLOAD]

1. Introduction

1.1 Importance of OST Viewer Tool

An OST (Offline Storage Table) viewer tool is a crucial application for anyone who uses Microsoft Outlook extensively. It allows users to access emails, contacts, calendars, tasks and other items stored in an OST file, even in the absence of an Exchange Server connection or when Outlook is not in operation. Whether for business or personal purposes, an OST viewer can be a lifeline for users who need to access important data in offline mode.

You can also use OST to PST conversion tools such as DataNumen Exchange Recovery to convert your OST file to PST file, then open the PST file and view its contents in Outlook directly:

Free download

1.2 Objectives of this Comparison

This comparison aims to provide a detailed and fair assessment of the top OST Viewer tools available today. By juxtaposing the key features, pros, and cons of each product, we aim to guide users in choosing the most suitable viewer based on their particular needs and preferences. We hope this comparative review helps users make an informed decision, saving them valuable time and resources while ensuring a smooth and hassle-free email management experience.

2. Betavare OST Viewer

Betavare OST Viewer is a standalone utility designed to allow users to view and examine their OST files without the need for MS Exchange Server. In the case that Outlook is not running or MS Exchange is not connected, the OST Viewer tool lets users access their mailbox items such as emails, contacts, calendars, tasks, and more.

2.1 Pros

• Free of Charge: Betavare OST Viewer is completely free to use, making it an excellent choice for those on a budget looking to manage their OST files.
• Intuitive Interface: The tool boasts a user-friendly interface, making it easy for even beginners to navigate and view their files effectively.
• No Exchange Requirement: This tool does not necessitate the presence of an MS Exchange Server installation to function.

2.2 Cons

• Limitations in Free Version: While this tool is free, some advanced features may be inaccessible or limited in this free version.
• Lack of Support: As a free tool, Betavare OST Viewer does not provide extensive customer support assistance that may be needed by some users.

3. KDETools OST Viewer

KDETools OST Viewer is an efficient program that allows users to view and read OST files even without an active MS Exchange Server connection. This utility enables direct viewing of mailbox contents, including emails, attachments, tasks, notes and many other items.

3.1 Pros

• Safe OST Viewing: KDETools OST Viewer offers a secure platform for reading OST files without modifying or altering the original content.
• Show Deleted Items: This tool is also capable of retrieving and displaying mailbox items that have been deleted.
• No File Size Limit: Users can upload and view OST files of any size, with no restrictions on the size of the file.

3.2 Cons

• No Export Function: In the free version of KDETools OST Viewer, one cannot export the viewed files to a different format or an external device.
• Premium Support is Paid: While the tool is free, access to dedicated customer support comes only with the paid version.

4. MailsDaddy OST Viewer

MailsDaddy OST Viewer is an effective tool for viewing and reading Outlook OST files without requiring MS Exchange Server. This software allows users to access and examine various mailbox elements such as emails, attachments, contacts, tasks, notes, and more.

4.1 Pros

• Comprehensive Viewing: MailsDaddy OST Viewer provides wide-ranging exploration of OST files, from emails to attachments and extra mailbox components.
• User-Friendly: This tool features an easy-to-navigate interface that even beginners can quickly get familiar with.
• Secure Access: It facilitates safe access to OST files without making any changes to the original data.

4.2 Cons

• No Export or Conversion: The free version of MailsDaddy OST Viewer only allows viewing; it does not support exporting or converting OST files.
• Limited Customer Support: While there some support resources are available, real-time customer support is not provided in the free version.

5. Mail Backup X

Mail Backup X is not just an OST viewer but also an email backup solution. It allows users to view and save emails from various mail clients including those stored in OST format. This tool can display contents like emails, calendar items, contacts, and even encrypted content.

5.1 Pros

• Multifunctionality: Aside from viewing OST files, it also offers backup, archiving, conversion, and even recovery functionalities.
• Supports Multiple Formats: Mail Backup X can work with a range of file formats from various email clients, making it a flexible tool.
• Encrypted Content: This tool provides the capability to view encrypted and password-protected OST files, which is not common among free OST viewers.

5.2 Cons

• Paid Tool: Unlike others on the list, Mail Backup X is not a free tool which might be a deterrent for some users.
• Complex Interface: Due to its extensive functions, the interface can be somewhat overwhelming for novice users.

6. BitRecover OST Viewer

BitRecover OST Viewer is a reliable and efficient tool for opening and viewing OST files. With its intuitive design and powerful features, it provides users with a seamless experience as they access and manage their OST files without an active MS Exchange Server connection.

6.1 Pros

• Dual Scan Mode: BitRecover OST Viewer offers two scanning modes – Quick scan and Advanced scan, allowing for flexible file retrieval.
• Reads Encrypted Files: This tool can open and read OST files encrypted with S/MIME or OpenPGP, making it excellent for security-conscious individuals.
• Zero Alteration: Upon reading the OST files, the tool assures that there’s absolutely no change to the original content or structure.

6.2 Cons

• No Export Function: BitRecover OST Viewer does not possess an export function, limiting its functionality, especially for those who wish to transfer their data.
• Premium Features Require Upgrade: While free to use, accessing some advanced features necessitates upgrading to the paid version.

7. Aryson OST Viewer

Aryson OST Viewer is a user-friendly tool that allows for easy viewing and reading of OST files without requiring a connection to MS Exchange Server. The software allows access to emails, attachments, contacts, tasks, and calendar items in an OST file with relative ease.

7.1 Pros

• Quick OST File Viewer: With Aryson OST Viewer, users can quickly open and read OST files without any trouble.
• Compatible with All Versions: This tool is compatible with all versions of Outlook and Windows OS, providing a broader user base access.
• Performs Deep Scan: It effectively retrieves data from OST files through a deep scan function, which can bring up even hard-to-find files and data.

7.2 Cons

• No Export Option: The software does not allow exporting of the viewed OST file data in its free version.
• Limited Customer Support: The free version of Aryson OST Viewer does not offer dedicated customer support.

8. Softaken OST Viewer

Softaken OST Viewer is a standalone tool that enables users to view and read their OST files without the need for an MS Exchange Server connection. It provides access to all the items in an OST file including emails, attachments, contacts, tasks, and other mailbox components.

8.1 Pros

• Fast and Reliable: Softaken OST Viewer exhibits superior performance in terms of speed and reliability when opening and reading OST files.
• Simple Interface: Its user-friendly interface makes it easy for users of all levels of expertise – from beginners to professionals.
• Supports All Outlook Versions: The tool is compatible with all versions of Outlook, offering a wide range of usability.

8.2 Cons

• No Recovery Feature: This software lacks a recovery feature, which may be necessary for corrupted OST files.
• No Export Function: The free version does not permit users to export the OST file contents to different file formats or an external device.

9. eSoftTools OST Viewer Software

eSoftTools OST Viewer Software is a powerful tool designed for viewing and analyzing OST files without requiring MS Exchange Server. Whether you need to browse emails, calendar, contacts, or other mailbox items, this software provides the necessary functionalities in an easy-to-use interface.

9.1 Pros

• Fully Functional: eSoftTools OST Viewer Software provides full viewing functionality, allowing users to easily browse all elements within the OST files.
• User-friendly: With an intuitive interface, the software is easy to navigate, requiring no technical expertise.
• Secure: The tool offers a safe environment to view files, ensuring there’s no alteration or damage to the original data.

9.2 Cons

• No Export Feature: This software does not support exporting of data, a feature that might be necessary for certain users.
• Paid Upgrade: While basic viewing is available for free, some advanced features require upgrading to a paid version.

10. USLSoftware OST Extractor PRO

USLSoftware’s OST Extractor PRO is a powerful and versatile tool that surpasses mere viewing capabilities. It allows users not only to view and read their OST files without an MS Exchange Server but also to convert and extract data from their OST files to various other formats.

10.1 Pros

• Conversion Features: This software transcends the conventional limits of an OST Viewer, offering conversion of OST files into multiple formats like PST, MBOX, EML etc.
• Interface: With a user-friendly interface, navigating across the software is effortless for users irrespective of their tech-savviness.
• Data Integrity: It ensures that the original structure and metadata of the files remain intact during the viewing or conversion process.

10.2 Cons

• Premium Software: OST Extractor PRO is not a free tool, which may be a drawback for users seeking costless solutions.
• Complex Functions: The conversion and extracting functions may be intricate for novices, confusing users who simply desire to view OST files.

11. ZOOK OST Viewer

ZOOK OST Viewer is a popular tool designed to view and read OST files effortlessly without requiring any kind of connection to MS Exchange Server. The software effectively manages the access to mailbox items like emails, contacts, calendar details, and more.

11.1 Pros

• Simple Interface: ZOOK OST Viewer comes with an intuitive and user-friendly interface, which makes navigating the software simple for any user.
• Preview Feature: This tool offers a preview feature, allowing users to view all the data in OST files before actually viewing them.
• Standalone Application: It is a standalone application that does not require Outlook or Exchange Server for viewing OST files.

11.2 Cons

• Basic Functions Only: The software offers only basic viewing functions, lacking advanced features like OST to PST conversion or data exporting.
• Restricted Viewing: In the free version, you can only preview the OST file items. To save the data, you need to upgrade to the pro version.

12. PST Walker OST PST Viewer

PST Walker OST PST Viewer is a powerful and efficient viewer capable of opening and browsing both OST and PST files. The software enables users to view mailbox items, including emails, attachments, contacts, tasks, etc., making it a comprehensive tool for managing Microsoft Outlook data files.

12.1 Pros

• Dual File Support: PST Walker not only supports OST files but also PST files, offering extended flexibility for users of both types of data files.
• Thorough Viewing: It performs a thorough scanning and viewing of files, allowing even deleted items to be seen.
• Embedded Image Extraction: Unique to this tool, the software has capabilities to extract embedded images from email body text.

12.2 Cons

• Not Free: PST Walker comes at a cost, which might make it less attractive for those looking for a free OST viewer.
• User Interface: Some users may find the UI not as friendly or intuitive as other similar tools available on the market.

13. CoolUtils Outlook Viewer

CoolUtils Outlook Viewer is a free software tool designed to manage and view all Outlook emails and attachments. It directly operates the OST files without the need for Microsoft Exchange Server. The ease of use, coupled with its capability to read and search through various emails efficiently, makes it a viable option for those looking for free OST viewer tools. However, it is comparatively basic and may lack some advanced features found in other paid or specialized tools.

13.1 Pros

• Free of charge: As a freeware, it offers cost-savings, making it suitable for users with budget constraints.
• User-friendly: The interface is simplistic and easy to navigate. Even novice users can comfortably use the tool.
• Exports MSG/EML: Provides some level of OST file conversion, with options to export emails to TXT, MSG, and EML formats.

13.2 Cons

• Limited Features: This viewer doesn’t support some of the more advanced features offered by other OST viewer tools, such as data recovery and extensive OST to PST conversions.
• No support for large files: It struggles to maintain speed and performance when dealing with large OST files.
• Occasional crashes: Some users have reported unexpected tool crashes while using CoolUtils Outlook Viewer.

14. GainTools OST Viewer

GainTools OST Viewer is a standalone tool that enables users to view, read, and open OST files without Microsoft Outlook. It offers a straightforward solution to access major OST components, such as emails, calendars, and contacts. With no file size limitation, this viewer can handle large OST files, while also maintaining a clean and user-friendly environment.

14.1 Pros

• No File Size Limitations: Regardless of the OST file size, GainTools OST viewer can access it with its no file size limitation feature.
• Comprehensive Viewing: It supports viewing of all major components of an OST file including emails, calendars, and contacts.
• User-friendly Interface: The tool offers a clean and clutter-free user interface that is easy to navigate, even for novice users.

14.2 Cons

• No Conversion Option: The tool doesn’t have the ability to convert OST files to other file formats.
• Limited Features on Free Version: To unlock some advanced features, users need to upgrade to the paid version offering.
• No Data Recovery: Unlike some other tools, it does not offer the ability to recover permanently deleted items from OST files.

15. PCVITA OST File Viewer

PCVITA OST File Viewer is a free and independent tool that opens and reads OST files without the need for Microsoft Exchange Server or Microsoft Outlook. It provides a complete preview of all the items such as emails, calendars, contacts, notes, and journal entries stored in the OST file. With its advanced search option, users can easily find and view specific emails or other data items within the OST file.

15.1 Pros

• Detailed Previewing: The software provides a full preview of all OST components, such as emails, calendars, and contacts.
• Advanced Search Option: It allows users to search for specific emails or data items within the OST file, which improves data discovery.
• No Dependency: Can open OST files without needing Exchange Server or Outlook, thus offering flexibility.

15.2 Cons

• Limited Functionality: While it provides viewing and searching capabilities, it lacks other features such as OST file conversion or data recovery.
• Complex UI for Beginners: Novice users might find the interface a bit complicated compared to other viewers with a more straightforward UI.
• Opens Healthy Files Only: PCVITA OST File Viewer is unable to open or repair corrupt OST files, which can be a major drawback for some users.

16. Recoveryfix OST Viewer

Recoveryfix OST Viewer is a professional tool with an easy-to-use approach for viewing and reading Outlook OST files. It comes with a simplified user interface to ensure an effortless process even for novice users. Additionally, it supports viewing of OST files from different versions of MS Outlook, including 2019, 2016, 2013, 2010, 2007, 2003, 2002, and 2000.

16.1 Pros

• Opens Corrupt Files: This viewer can open even corrupt or damaged OST files, which sets it apart from many other tools.
• Multiple Outlook Versions Support: It supports OST files from a wide range of MS Outlook versions, thus catering to various user needs.
• User-friendly Interface: Offers an easy-to-use interface that is suitable for novice and professional users alike.

16.2 Cons

• No Conversion Option: It lacks the ability to convert OST files to other useful file formats such as PST, EML, or MSG.
• No Advanced Search: It lacks an advanced search option, making it difficult to search for specific mails or components in the OST files.
• No Data recovery: Although it can open corrupted files, it doesn’t offer the ability to recover the OST file data. This can be a major disadvantage for users who need to recover data from OST files.

17. PC Info Tools OST Viewer

PC Info Tools OST Viewer is a free and compact tool with the unique capability of viewing and opening healthy as well as corrupted OST files. With no dependency on MS Outlook, this tool gives you full access to all your OST file items such as emails, notes, contacts, and calendars. It provides a hassle-free operation, regardless of the size of the OST file.

17.1 Pros

• Reads Corrupted Files: This tool can open and view both healthy and corrupted OST files, making it a versatile choice.
• No Size Limitations: PC Info Tools OST Viewer can manage OST files of any size without any performance issues.
• No Outlook Dependency: This viewer can operate independently without needing MS Outlook, offering users greater flexibility in managing OST files.

17.2 Cons

• No Conversion Options: It does not provide features to convert OST files into other formats such as PST, EML, MSG, etc.
• Lacks Advanced Search: The tool does not have an advanced search option, which can make it difficult to locate specific mails or OST components.
• Barebones Interface: Its user interface is basic, lacking in aesthetics, and might appear outdated to some users.

18. MacSonik OST Viewer Mac

MacSonik OST Viewer Mac is a dedicated tool for macOS users. The software allows you to open and view OST files without the need for any additional software. It recognizes all formats of attachments, and users can view attachment files directly in the tool. With a simple and clean interface, it offers easy navigation for all users.

18.1 Pros

• Optimized for Mac: The tool is specifically designed to run on macOS, ensuring optimized performance for Mac users.
• View Attachments: It supports all attachment formats, giving users ease and convenience when viewing attached files.
• Simple Interface: The interface is clean and well-organized, making the tool easy to navigate even for novice users.

18.2 Cons

• OS Specific: This software only operates on macOS, excluding a significant portion of users operating on different platforms.
• Limited Features: It does not provide advanced features such as OST conversion or data recovery.
• No Advanced Search: Searching for specific mails or components can be a challenge as it does not offer an advanced search feature.

19. MacUncle PST to MSG Converter

Despite its name, MacUncle PST to MSG Converter is not limited to merely these two formats. It also has the capability to view and open OST files on a Mac system. It can handle any size of OST files and smoothly navigate through different folders of an OST file. The software also allows users to view OST emails along with their attachments.

19.1 Pros

• Fast Processing: This tool promises to deliver fast and accurate conversion results, regardless of the size of the OST file.
• Preview Attachments: The viewer allows users to view OST email attachments, providing an all-round viewing option.
• MAC-Based Solution: Designed specifically for macOS, ensuring optimized and smooth operation for Mac users.

19.2 Cons

• Not Free: Unlike some of the other tools, MacUncle PST to MSG Converter is not a free tool.
• OS Specific: The software only caters to Mac users, thus excluding a large population of Windows users.
• Complicated User Interface: Some users have reported the program’s interface to be less intuitive compared to other tools, which might make it a bit harder to navigate especially for novices.

20. MailConverterTools OST Viewer

MailConverterTools OST Viewer is a robust tool designed to open and read OST files without Outlook. It allows users to view all OST file data, including the Inbox, Outbox, Sent Items, Deleted Items, Drafts, Calendar Items, Notes, Tasks, Journals, and more. With high compatibility, it supports OST files generated from any version of MS Outlook.

20.1 Pros

• High Compatibility: Supports OST files created by any version of MS Outlook, enhancing its overall usability.
• Comprehensive Viewing: Allows users to view all data items in the OST file.
• Simple Interface: Features a user-friendly and intuitive interface for easier navigation.

20.2 Cons

• No Saving Options: While you can view and read OST files, the software does not allow you to save any data.
• Limited Advanced Features: Does not offer advanced features such as OST to PST conversion.
• No Support for Corrupted Files: The viewer does not have the ability to open or repair corrupted OST files.

21. FreeViewer OST Viewer

FreeViewer OST Viewer is a professional tool designed to open and read the contents of OST files irrespective of file size. With no need for an Exchange Server or MS Outlook, it provides complete visibility of OST contents, including emails, calendars, tasks, notes, and journals. The product prides itself on its clear interface and straightforward operation.

21.1 Pros

• Viewing Versatility: Supports viewing of a variety of OST file elements like emails, calendars, tasks, and more, offering comprehensive coverage.
• No File Size Limit: The file size of the OST does not affect the viewer’s performance, making it reliable even for large files.
• Simple User Interface: The sleek and intuitive design makes it easy to navigate, even for new users.

21.2 Cons

• No Conversion Options: The tool solely focuses on viewing OST files but does not support converting them to other formats.
• No Support for Corrupted Files: It lacks the ability to open or recover corrupted or damaged OST files.
• No Advanced Search: Limited search capabilities can make it harder for users to locate specific emails or elements within the OST file.

22. DRS OST Viewer

DRS OST Viewer is a versatile tool developed to open, view and analyze OST files effectively. It offers an extensive range of OST file viewing features. With no need for Outlook or Exchange Server installations, it comprehensively opens and views OST file items like emails, calendars, contacts, tasks, etc. Hence, it supports the viewing of healthy as well as corrupt OST files.

22.1 Pros

• Wide Range of Features: Offers comprehensive OST viewing features, including reading even corrupt OST files.
• No Outlook Dependency: Can fully operate without the need for MS Outlook or Exchange Server, thus providing more accessibility.
• Intuitive Interface: Features a user-friendly interface that makes tool navigation simpler for all types of users.

22.2 Cons

• No Conversion Function: The tool fails to deliver any conversion feature for OST files.
• Doesn’t Repair Corrupt Files: Despite being able to view corrupt OST files, it doesn’t have any functionality to repair the file.
• No Advanced Search: It lacks an advanced search feature for easy discovery of specific mail items.

23. SysInspire OST File Recovery Software

SysInspire OST File Recovery Software is a comprehensive tool that goes beyond merely viewing OST files. Besides displaying OST file content, it also recovers data from corrupt or inaccessible OST files and then allows viewing of the recovered content. Furthermore, it has the ability to convert OST files to PST and multiple other formats.

23.1 Pros

• OST File Recovery: The tool provides the unusual feature of recovering data from corrupt or damaged OST files.
• Conversion Feature: In addition to viewing and recovery, the software can also convert OST files to a variety of formats including PST, EML, MSG, HTML, and others.
• View Recovered Content: Allows users to view each item recovered from OST files.

23.2 Cons

• Not Free: Unlike some viewers, this tool doesn’t provide its services for free. Users need to purchase the software to access its full benefits.
• Overwhelming Interface: For novice users, the wealth of options and features might make the interface a bit overwhelming and confusing.
• Large File Handling: Performance can slow down while handling large OST files, leading to longer recovery and conversion times.

24. Kernel OST Viewer

Kernel OST Viewer is a widely recognized tool known for its user-friendly interface and efficient performance. With it, users can view OST files without the support of Exchange Server. It also allows users to access emails, calendar entries, contacts, and other information safely while retaining the structure and hierarchy of the original data.

24.1 Pros

• User-Friendly Interface: Even for novice users, Kernel OST Viewer is straightforward to navigate and understand.
• No Exchange Server Required: Users can access their OST files without needing an active Exchange Server connection.
• Data Integrity: It maintains the structure and hierarchy of the original data, ensuring no information loss or alteration.
• Advanced Search Feature: This tool has an advanced search feature to find specific emails or files based on different criteria.

24.2 Cons

• Limited File Size: This Kernel OST viewer tool may face problems handling larger OST files effectively.
• No OST to PST Conversion: Unlike some other tools, Kernel OST Viewer doesn’t offer data conversion from OST format to PST.
• Slow Loading Time: Users have reported that the tool takes a longer time to load files which can delay the viewing process.

25. Cigati OST Viewer

Cigati OST Viewer is a highly robust tool designed to allow users to view and read OST files in the absence of Exchange Server. It offers advanced features such as smart preview options and maintains the data integrity of OST files. In addition, Cigati OST Viewer supports viewing encrypted OST files, providing additional security features.

25.1 Pros

• Encryption Support: Unlike many other available tools, Cigati OST Viewer supports viewing encrypted OST files, adding an extra layer of security.
• Smart Preview Options: It offers various preview options, enabling users to view mailbox items in detail before opening the actual OST file.
• Excellent Compatibility: The tool is compatible with all versions of Windows and supports OST files from multiple versions of MS Outlook.
• User-Centric Interface: With its intuitive and simple interface, Cigati OST Viewer can be easily utilized even by individuals with minimal technical knowledge.

25.2 Cons

• Lack of Conversion Features: The tool lacks OST-to-PST conversion capability, limiting the functionality for users who may need to convert their OST data.
• Limited File Processing: There have been reports of slower processing times when dealing with larger OST files.
• Advanced Features are Premium: For accessing some advanced features, users will have to upgrade to the paid version.

26. Turgs OST Viewer

Turgs OST Viewer is a widely known OST viewer tool that provides an easy way to open, read, and view OST files without the need for an exchange server. This tool allows users to analyze OST files and supports encrypted OST files. An integral feature of the Turgs OST viewer is its support for large OST files.

26.1 Pros

• Large File Support: Turgs OST Viewer excels at processing large files smoothly without any lags or crashes.
• Encryption Support: This tool supports encrypted OST files, providing an extra layer of security to your sensitive data.
• User-friendly Interface: Even users with limited technical knowledge can easily navigate and utilize the Turgs OST Viewer due to its simple design.
• Compatibility: The tool is compatible with all versions of Windows and supports OST files from various versions of MS Outlook.

26.2 Cons

• No Conversion Feature: Turgs OST Viewer does not offer OST-to-PST conversion, a feature that some users might require.
• Slow File Loading: There have been user reports of slower file loading times, particularly with larger OST files.
• Advanced Features Require Upgrade: To access advanced features or for better functionality, users need to upgrade to the paid version.

27. EmailDoctor OST Viewer

EmailDoctor OST Viewer is an eminent tool designed for viewing and accessing OST files without MS Exchange Server. It allows users to view emails, contacts, calendars, tasks, and notes safely without security concerns. Importantly, EmailDoctor OST Viewer can handle large OST files, overcoming the size limitations presented by some other tools.

27.1 Pros

• Large OST Files Handling: It comes with a robust engine capable of handling even large OST files, making it a great option for businesses and enterprises.
• Access to Comprehensive OST Data: Apart from typical emails, the tool also grants users access to contacts, calendars, tasks, and notes in the OST files.
• Simple User Interface: Its user interface is clean and simple, simplifying the viewing process even for users with limited technical knowledge.
• Preserves Data Integrity: EmailDoctor OST Viewer maintains the integrity of the data structure, ensuring no loss or alteration during the viewing process.

27.2 Cons

• Slower Processing Speed: Some users find the processing speed of EmailDoctor OST Viewer to be relatively slow, especially with larger files.
• No OST to PST Conversion: One downside is the lack of an OST-to-PST conversion feature, which can limit functionality for some users.
• Premium Features Require Payment: Access to advanced features requires the purchase of the premium version, which could be a deterrent for some users.

28. RecoveryTools OST Viewer

RecoveryTools OST Viewer is a proficient tool for viewing OST files without the need for Exchange Server. Irrespective of the size, this utility can handle OST files efficiently without any processing delays. It offers an intuitive platform to view all mailbox items, including emails, contacts, calendar entries, tasks, journals, and notes.

28.1 Pros

• Large File Support: RecoveryTools OST Viewer is capable of handling large OST files with impressive ease, ensuring efficient management of massive data.
• Comprehensive Viewing: Not only emails, but this tool also allows viewing of other mailbox items such as contacts, calendars, tasks, journals, and notes in an OST file.
• Fast Processing: Despite being a free tool, RecoveryTools OST Viewer provides quick and powerful processing of OST files.
• Handling of Corrupt Files: This tool has the capability to open and view damaged or corrupt OST files, which makes it stand out.

28.2 Cons

• No Conversion Option: There’s no option available for converting OST files to other formats like PST, which can be a limiting factor for some users.
• Feature Limitations: While the tool is feature-rich, some advanced features like viewing encrypted files are not available in the free version.
• Complicated User Interface: Some users report the tool’s interface as slightly complex and overwhelming, especially for beginners.

29. EdbMails OST viewer

The EdbMails OST Viewer is offered as a freeware utility designed to allow users to open and view OST files without requiring the Exchange Server. This tool is known for its advanced capabilities, such as the ability to view corrupt or damaged OST files, maintaining the overall integrity of the data.

29.1 Pros

• Corrupt File Support: EdbMails OST Viewer supports viewing corrupt or damaged OST files, offering special functionality to recover data from these files.
• Preserves Stability and Integrity: The tool maintains the overall integrity of the data and ensures that no alteration or loss of information takes place during the viewing process.
• View Comprehensive Data: Users can preview all aspects of their OST files such as emails, contacts, calendars, tasks, and notes.
• Free Utility: As a freeware tool, EdbMails OST Viewer provides a robust set of features without any cost to the user.

29.2 Cons

• Complex User Interface: Some users have found the interface to be a bit complex and challenging to navigate, especially for first-time users.
• No Conversion Feature: The tool does not offer the capability to convert OST files into PST or any other format.
• Potential Performance Issues: Some users have reported performance issues such as slow processing times and long loading durations.

30. SysData OST Converter

SysData OST Converter is more than just a viewer; it’s a comprehensive tool that combines file viewing with conversion functionalities. It allows users to open, read and convert OST files into different formats, thereby offering multifaceted capabilities. It even enables the recovery of soft-deleted items from OST files.

30.1 Pros

• Conversion Capabilities: Unlike other tools, SysData OST Converter offers the ability to convert OST files into different formats like PST, EML, MSG, and MBOX, making it highly versatile.
• Recovery of Deleted Items: The tool allows the recovery and viewing of soft-deleted items from OST files, an advanced feature not presented by many other tools.
• Comprehensive File Viewing: Just like any OST viewer, it allows users to view emails, contacts, calendar entries, and other data within OST files.
• User-friendly Interface: Its interface is simple and intuitive, making it accessible to users with different levels of technical expertise.

30.2 Cons

• Speed Limitations: Some users have reported that the speed of conversion can be slow at times, particularly for larger files.
• Multiple Features Can Be Overwhelming: For users who just need a simple viewer, the additional features could be unnecessary and overwhelming.
• Full Features Require Purchase: While the basic version is free, access to comprehensive features requires purchase of the full version.

31. BitVare OST Viewer

BitVare OST Viewer is a reliable tool to access OST files without requiring the Exchange Server connectivity. This utility offers a hassle-free method to view OST file data like emails, contacts, tasks, calendars, and notes. BitVare OST Viewer supports viewing multiple files and provides a quick preview of OST file contents.

31.1 Pros

• Multiple File Support: BitVare OST Viewer allows viewing of multiple OST files, which considerably helps in managing and analysing the data.
• Preview Capabilities: The tool provides a quick preview of OST file contents, aiding users to navigate through data before opening the actual file.
• Non-Exchange Environment Compatibility: The tool functions perfectly in a non-Exchange environment, ensuring no disruption to user activities.
• Ease of Use: With a user-friendly interface, BitVare OST Viewer simplifies the process of viewing OST files even for novice users.

31.2 Cons

• No Advanced Search: The tool seems to lack an advanced search option which would allow users to locate specific files or data.
• No Conversion Feature: Absence of an OST-to-PST conversion feature might be a limiting factor for some users.
• Slow with Large Files: Users have reported that BitVare OST Viewer can be rather slow when working with large-size OST files.

32. SysKare OST Viewer

SysKare OST Viewer is a robust tool that provides users with efficient and hassle-free access to OST files irrespective of Exchange Server connectivity. This tool allows viewing all kinds of data enclosed in the OST files, including emails, contacts, notes, calendar entries, tasks, etc. It maintains the original structure of the data, ensuring no loss of information during the process.

32.1 Pros

• Data Integrity: SysKare OST viewer maintains the integrity of the original data, assuring no alteration during the viewing process.
• Comprehensive Viewing: The tool allows users to view all types of OST data such as emails, contacts, calendar entries, tasks, notes, etc.
• Easy Navigation: It provides an interactive and user-friendly interface that enables quick and smooth navigation.
• High Compatibility: SysKare OST Viewer is compatible with all versions of Exchange Server, Microsoft Outlook, and Windows Operating System.

32.2 Cons

• No Conversion Option: Despite its qualities, SysKare OST Viewer does not provide a feature for OST to PST conversion, which some users might find limiting.
• Limited Advanced Features: The tool lacks some advanced features, such as detailed filtering and sorting capabilities, which are often found in similar tools.
• Slow with Large Files: Users have reported slow performance when working with larger OST files.

33. Recovery Toolbox OST Viewer

Recovery Toolbox OST Viewer is a potent tool designed to help users view and analyze OST files without the presence of Exchange Server. One of its notable features is its ability to repair and recover damaged or corrupt OST files, thereby aiding users in seamless data restoration and viewing process.

33.1 Pros

• Corrupt File Repair: Its ability to repair and recover corrupt or damaged OST files distinguishes it from many other OST viewers in the market.
• Comprehensive Data Viewing: Like most OST viewers, it also allows access to various types of OST data including emails, contacts, calendar entries, tasks, and notes.
• User-Friendly Interface: With a clear and easy-to-navigate interface, the tool ensures a smooth user experience even for those with minimal technical knowledge.
• Compatibility: It is highly compatible and works well with all versions of MS Outlook and Exchange Server.

33.2 Cons

• Limited Features in Free Version: Although offering a free version, it comes with limited functionality, and users have to invest in the premium version for comprehensive features.
• Slow Loading Time: Some users have reported that files take longer to load, particularly when viewing larger OST files.
• No Conversion Feature: There’s no feature available to convert OST files to PST or any other formats, which can be limiting to some users.

34. XstReader

XstReader is an open-source OST viewer hosted on GitHub, making it a popular choice among developers and tech-savvy users. It can open and read OST files without the need for Exchange Server. XstReader is written in Python, allowing users who are familiar with the language to customize the tool according to their unique requirements.

34.1 Pros

• Open-Source: As an open-source project, the source code of XstReader is available for anyone who wishes to understand it or make improvements.
• Customizable: Users with Python coding skills can customize XstReader based on their unique requirements.
• Exchange Server Independent: The tool allows you to view OST files even without Exchange Server connectivity.
• Supports Viewing Various Data: It lets you view different types of data from the OST file, such as emails, contacts, calendar entries, tasks, and notes.

34.2 Cons

• Tech Savviness Required: For non-technical users, using and benefiting from XstReader could be challenging due to its coding language requirement.
• No GUI: XstReader does not provide a graphical user interface, which may make it harder for users who are not comfortable with command-line tools.
• No Conversion Feature: The tool does not offer OST to PST conversion, which is a feature that some users might require.

35. Stellar Viewer for OST

Stellar Viewer for OST is a proficient tool that enables users to open and view OST files effortlessly without requiring the Microsoft Outlook platform. It provides detailed views of all personal folders such as emails, contacts, calendar items, and notes in OST files. It also displays a count of the total number of items present in a specific folder of the OST file.

35.1 Pros

• Easy viewing: Stellar Viewer for OST provides a simple layout for viewing OST files without a server connection.
• Feature-rich interface: It offers a comprehensive feature set, including an option to search for desired items, navigate through the folder hierarchy, and view the total item count.
• Supports encrypted files: The viewer is also capable of opening and viewing encrypted or password-protected OST files.

35.2 Cons

• Limited File Saving: The Stellar OST viewer is mainly for viewing OST files. To save the OST data in different file formats, users need to upgrade to the paid edition.
• Lack of advanced features: While it does offer a solid set of features, it lacks some advanced ones, such as conversion of OST to PST or OST recovery, that other tools may provide.

36. Stellar Converter for OST

Stellar Converter for OST is a comprehensive tool that not only allows users to view OST files but also performs conversion from OST to PST format. This feature-rich tool facilitates a complete extraction of all mail components within the OST files, including emails, contacts, calendars, notes, etc., and converts them into accessible PST format.

36.1 Pros

• Powerful conversion: Stellar Converter converts OST files to PST efficiently, ensuring no data is lost during the process.
• Supports large OST files: It can convert OST files of any size, making it suitable for both personal and professional use.
• Multi-format output: The converter supports output to multiple formats (PST, MSG, EML, RTF, HTML, and PDF), giving users greater flexibility.

36.2 Cons

• Requires Outlook: To complete the conversion process, MS Outlook installation is necessary.
• Paid tool: Though it offers a demo version, the complete conversion and advanced features require the purchase of the full version.

37. Shoviv OST Viewer Tool

Shoviv OST Viewer Tool is a competent OST viewing software that enables users to open OST files and view the entire mailbox components without requiring MS Outlook. It offers a quick, secure, and easy way to access and read OST files, including emails, calendars, notes, tasks, and contacts.

37.1 Pros

• User-friendly interface: This tool offers a simple and straightforward user interface. The ease of navigating through its features makes it a preferred choice among users.
• No file size limitation: Shoviv OST Viewer can open OST files of any size. Thus, making it great for businesses that deal with large OST files.
• Free to Use: Unlike many of its counterparts, this tool offers free access to all its features without requiring any paid upgrade.

37.2 Cons

• Limited features: The tool is primarily for viewing OST files – it doesn’t provide options for converting or saving OST files in different formats.
• No support for encrypted files: It fails to open encrypted or password protected OST files effectively.

38. FileViewers OST File Viewer

FileViewers OST File Viewer is an efficient tool to view and read OST files without the dependencies of Microsoft Exchange Server or Microsoft Outlook. It is capable of opening corrupted and damaged OST files and offers a user-friendly interface to navigate through the mailbox content in an OST file.

38.1 Pros

• Handles corrupted files: FileViewers OST File Viewer can open and view information within corrupted or damaged OST files.
• Preview feature: It provides a quick preview of the OST file data items before opening them, assisting users in locating specific information efficiently.
• Zero dependencies: It does not require the installation of MS Outlook or connectivity with MS Exchange Server.

38.2 Cons

• Limited functionality: While it allows viewing and reading OST files, it lacks the feature of saving these files into other formats.
• No support for encrypted files: The tool does not support viewing encrypted or password-protected OST files.

39. Groupdocs View OST online

Groupdocs View OST online is a web-based tool that facilitates viewing OST files online. There’s no need to download or install any additional software. The tool has been designed specifically to open emails from OST files and allows users to freely view their content online.

39.1 Pros

• No software required: The big advantage of this tool is its convenience, as there’s no need to download or install any software.
• Accessibility: The tool is web-based, which means it can be accessed and used from any device with an internet connection.
• User-Friendly: It also boasts an intuitive interface, making it easy for users to navigate and use.

39.2 Cons

• Limited capabilities: Since it’s an online viewer, features such as saving or converting OST files into various other formats are non-existent.
• Data privacy concerns: With it being an online tool, there might be concerns related to the security and privacy of data.

40. 4Team Corporation – OST PST Viewer

4Team Corporation’s OST PST Viewer is a versatile and useful tool for easily accessing and viewing OST and PST files without needing Outlook. It supports various file types, including contacts, emails, calendar entries, notes, and tasks. Furthermore, it allows for seamless searches across content within the files.

40.1 Pros

• Dual Support: With the capacity to open both OST and PST files, this viewer provides users with more flexibility and functionality.
• Advanced Search: It boasts an advanced search feature, which enables users to quickly locate required information from large-sized OST files.
• No Microsoft Outlook Dependency: Unlike some other viewers, this tool eliminates the need for Outlook installation to view OST or PST files.

40.2 Cons

• Limited Free Version: While there is a free version, it has access to limited features. Full access requires purchasing the Pro version.
• Complex Interface: The user interface, while feature-rich, may appear complex and overwhelming to users who are not tech-savvy.

41. MailsSoftware Free OST Viewer

MailsSoftware Free OST Viewer allows users to open and view OST file data without the need for MS Outlook or Exchange Server. The tool enables users to access various mailbox items like emails, contacts, calendars, tasks, notes and more. It also offers a dual mode to scan files; Quick and Advance, to handle corruption in OST files.

41.1 Pros

• Advance scanning: MailsSoftware OST Viewer offers both quick and advanced scanning options to ensure no data is missed due to corruption.
• Free to use: One of the tool’s main advantages is that it offers complete and unrestricted access to its features for free.
• Preview function: It provides a detailed preview of the content in the OST file before viewing it, making it easier to locate specific data items.

41.2 Cons

• No conversion support: The tool only supports viewing OST files and does not have a feature to convert them into other file formats.
• Limited features: While it offers basic functionalities for viewing OST files, it lacks some advanced features compared to other tools discussed here.

42. Aspose OST Reader

Aspose OST Reader is a web-based tool that allows accessing and viewing OST files without the need of Microsoft Outlook or any other software. This makes it a handy tool for users who often work on different machines and prefer an online viewer that requires no installation.

42.1 Pros

• Online solution: As it’s a web-based tool, it allows users to access and view OST files from any device with an internet connection.
• Wide compatibility: The Aspose OST Reader supports various OST files from different versions of MS Outlook.
• No additional software needed: As the tool can be accessed directly from a web browser, there is no need to install any additional software.

42.2 Cons

• Limited functionality: The primary function of this tool is to view OST files only. It doesn’t offer advanced features like OST to PST conversion or data extraction.
• Data privacy: Given its online nature, users might have concerns about data privacy and security.

43. DataHelp OST Viewer Tool

DataHelp OST Viewer Tool is specifically designed to view and open offline OST files without the need for Exchange Server or MS Outlook. It supports viewing of all data items in an OST file such as emails, calendars, contacts etc., and is entirely free of cost.

43.1 Pros

• Supports all types of OST files: The tool is capable of opening and viewing normal, corrupt, as well as orphaned OST files.
• Free of cost: DataHelp OST Viewer Tool provides access to all its features for free, making it a cost-effective solution for viewing OST files.
• No prerequisites: This tool does not require MS Outlook or Exchange Server to view OST files.

43.2 Cons

• No conversion option: The tool is only for viewing OST files. It doesn’t have the capability to convert OST files to PST or any other format.
• Lacks advanced features: Compared to other tools, the DataHelp OST Viewer Tool lacks advanced features such as advanced search, filtering options etc.

44. Data Repair Tools Free OST Viewer

Data Repair Tools Free OST Viewer is a reliable tool that allows users to freely view or open OST files without the need for MS Outlook or MS Exchange Server. This application displays all the contents of the OST file such as emails, contacts, tasks, calendars, notes, and others. It can also handle corrupted or inaccessible OST files.

44.1 Pros

• Supports Corrupted Files: Even if your OST file is corrupted or inaccessible, this tool ensures you can view its contents.
• Freeware: The tool is completely free to use, providing full access to all its features without any cost.
• Easy-to-use interface: The tool offers an intuitive user interface, making it easy for users to navigate and view their OST files.

44.2 Cons

• Limited functionality: The tool only provides a viewing feature for OST files. There are no options to convert or save the OST files in various other desirable formats.
• No support for encrypted files: It doesn’t allow users to open password-protected or encrypted OST files.

45. MS Outlook Help – OST File Opener

MS Outlook Help – OST File Opener is a proficient tool for viewing and reading OST files without the need for MS Outlook. It provides an easy and secure way for users to open OST files even when they are corrupted, damaged, password protected, or orphaned. The tool is a great help when Exchange Server connectivity isn’t available.

45.1 Pros

• Reliable and safe: This tool is secure and reliable, ensuring the integrity of data while opening and viewing OST files.
• Views all data: MS Outlook Help – OST File Opener allows users to view all OST data, including email messages, attachments, contacts, calendars, etc.
• Supports Encrypted files: The tool is capable of opening encrypted or password-protected OST files, which is a major plus.

45.2 Cons

• No conversion function: The tool doesn’t provide any option to convert or save the OST file in another format.
• Limited feature set: While it’s a competent viewer, it lacks some advanced features like OST to PST conversion or maintaining folder hierarchy, found in other tools.

46. FileProInfo OST Viewer

The FileProInfo OST Viewer tool is a user-friendly solution designed to open and view OST files effortlessly. It can deal with corrupted or healthy OST files, offering a preview of email messages and other components without the need for MS Outlook.

46.1 Pros

• Usability: The tool has an intuitive and user-friendly interface that requires no special technical skills.
• Data Integrity: This viewer maintains the original structure, properties, and formatting of the mails and other data.
• Corrupted File Handling: It can even deal with corrupt OST files, providing options to view and access the data within.

46.2 Cons

• Limit on File Preview: Sometimes, the tool faces difficulty to load and preview very large OST files.
• No Export Functionality: It is only a viewer, meaning you cannot export the viewed files to other formats.

47. OSTViewer – OST Viewer Tool

OSTViewer is a practical tool specifically designed to deal with OST files. It can open and read both healthy and damaged OST files without needing Outlook. The software provides a clear and organized preview of the contents, including emails, contacts, calendars, and more.

47.1 Pros

• Navigability: Its interface is easy to navigate, making it suitable for users of all skill levels.
• Damaged File Handling: The tool can open and read corrupted OST files, allowing you to recover important information.
• Multifaceted Preview: It can preview all types of data, including attachments, tasks, and calendar entries.

47.2 Cons

• Depends on MS Outlook: In spite of being a standalone tool, in certain scenarios it requires the presence of MS Outlook to perform adequately.
• No Export option: Although it’s a comprehensive viewer, it lacks the ability to export the viewed files into other formats.

48. Encryptomatic Ost/Pst Viewer Pro

The Encryptomatic Ost/Pst Viewer Pro is a powerful tool designed to access and view data in OST and PST files. This professional tool can open emails, calendars, tasks, contacts, and notes even in the absence of Outlook and regardless of whether the OST files are corrupted or healthy.

48.1 Pros

• Advanced Search: It sports an advanced search feature which enables users to quickly find specific mails or other data items.
• Convenient Organization: It offers convenient ways to organize data by grouping emails by attributes such as date, subject, or sender.
• Bulk Handling: It also manages mass tasks and efficiently handles large-sized OST files.

48.2 Cons

• Cost: Unlike some offline OST viewers, this one is not freeware and requires a paid license for full functionality.
• Complex Interface: Its interface could be overwhelming for some users, as it provides many advanced features.

49. DataRecoveryFreeware OST Viewer Freeware

DataRecoveryFreeware OST Viewer is a free tool designed to help users view OST files without having to install Outlook. It supports viewing of damaged OST files and also allows you to read encrypted OST files, making it an all-around OST viewer tool.

49.1 Pros

• Freeware: This OST Viewer tool is free of charge and doesn’t compromise on functionality.
• Encrypted File Support: The viewer supports both compressed and encrypted OST files, providing added versatility.
• Simplified Interface: Its interface is quite straightforward, which contributes to its overall user-friendliness.

49.2 Cons

• Lack of Preview Features: Compared to other software, it provides less detailed previews of OST files.
• Lack of Export Functionality: The tool is strictly a viewer and doesn’t provide options to export OST files to other formats.

50. Recovery-Tools OST Reader

The Recovery-Tools OST Reader offers a comprehensive solution to read and view OST files without requiring Outlook. Whether dealing with healthy or corrupted OST files, this tool can easily handle them and provide a detailed display of the data contents.

50.1 Pros

• Preview Options: The tool provides a detailed preview of all items in the OST files, including emails, contacts, tasks, and more.
• File Flexibility: Capable of reading both healthy and damaged OST files, it extends its reach in terms of applicability.
• User-friendly Interface: Its interface is easy to navigate which makes it suitable for users at all skill levels.

50.2 Cons

• No Export Features: The software lacks export functionalities, restricting its use to only viewing contents.
• No Advanced Searching: Unlike some of its counterparts, it doesn’t provide an advanced search option to quickly locate specific data in the OST files.

51. Convertertools OST File Viewer

The Convertertools OST File Viewer offers a user-friendly and reliable way to view OST file data. This includes emails, attachments, contacts, calendars, and more. The tool can work with both damaged and healthy OST files, showcasing its robustness.

51.1 Pros

• Diverse File Support: This software can process both damaged and healthy OST files, providing a wide range of file accessibility.
• Detailed Previews: The tool previews the OST files in a detailed layout, making it easy to analyze the data inside.
• Simple Interface: With its intuitive design, the user interface is easy to navigate, even for beginners.

51.2 Cons

• No Search Functionality: The tool lacks an advanced search feature, making it challenging to locate specific emails or other data items within large OST files.
• Export Limitation: Despite its viewing capabilities, it does not allow OST file data to be exported to another format.

52. DotStella OST File Viewer

DotStella OST File Viewer is a tool designed to open and view OST files regardless of their condition. It can handle corrupted as well as healthy OST files, and provides a thorough preview of all data including emails, attachments, contacts, and more.

52.1 Pros

• Broad File Support: The tool is capable of processing both healthy and corrupted OST files, enhancing its versatility.
• Detailed Preview: It offers extensive previews of the OST files, aiding in a thorough analysis of the data inside.
• Friendly User Interface: The software boasts an intuitive and beginner-friendly interface.

52.2 Cons

• No Search Feature: The tool does not offer an advanced search feature, which might pose challenges in pinpointing specific information in large OST files.
• No Export Option: Despite its comprehensive viewing features, it lacks the ability to export OST data to other formats.

53. OST2PSTware OST Viewer

OST2PSTware OST Viewer is a dedicated tool for viewing OST files without requiring Outlook. It can handle healthy and damaged OST files alike, providing a comprehensive overview of emails, calendars, contacts, tasks, and more.

53.1 Pros

• Compatibility: It is capable of dealing with both healthy and corrupted OST files, thereby broadening its compatibility range.
• Free of Charge: This tool is freeware, making it a cost-effective option for users who only need viewing capabilities.
• Easy-to-Use Interface: The tool’s interface is user-friendly and intuitive, perfect for users of all skill levels.

53.2 Cons

• No Search Function: The tool doesn’t offer an advanced search feature, which may make locating specific emails or other items challenging.
• Export Limitations: Despite its wide array of viewing functionalities, it does not permit data exportation to other file types.

54. OST2PSTWizard OST Viewer Tool

The OST2PSTWizard OST Viewer Tool is an advanced software solution designed specifically to open and view OST files. It can interact with both healthy and corrupted files, offering an in-depth look at emails, contacts, calendars, and more.

54.1 Pros

• Wide Compatibility: The tool successfully handles both healthy and corrupt OST files, offering a broad spectrum of usage.
• Detailed Preview: Offers a comprehensive preview of the OST files content, simplifying the task of analyzing the contained data.
• User-Friendly Interface: Its interface is designed to be intuitive and easy to navigate, making it suitable for beginners and professionals alike.

54.2 Cons

• No Search Feature: The lack of an advanced search option might make it harder to pinpoint specific emails or other data items in large OST files.
• Export Absence: Despite its good viewing capabilities, it does not provide the option to export the OST file data to other file formats.

55. Forensicware Outlook OST Viewer

Forensicware Outlook OST Viewer is a proficient tool developed with an intention to provide a straightforward approach in viewing OST files. It caters to both healthy and corrupted OST files, allowing users to gain a complete overview of various mail items like emails, calendars, contacts, and more.

55.1 Pros

• Robust Design: Capable of reading both healthy and damaged OST files, it shows robustness in being able to handle various file states.
• Detailed Outlook: The tool provides an exhaustive preview of all contents in the OST files, which aids in the thorough examination of the data.
• Simplified Interface: Its easy-to-use interface caters to users of all skill levels and ensures a seamless user experience.

55.2 Cons

• No Advanced Search Option: It lacks an advanced search feature, which can make locating specific information in hefty OST files more difficult.
• Export Constraints: Despite its wide-ranging viewing functionalities, the software does not offer the ability to export OST file data to other formats.

56. Acquire Forensics OST File Viewer

The Acquire Forensics OST File Viewer is a tool dedicated to providing a reliable and sufficient viewing of OST files data. It caters to both healthy and corrupted OST files, offering a full perspective of emails, calendars, contacts, tasks and other Outlook elements.

56.1 Pros

• Broad File Support: The software can successfully process both healthy and damaged OST files, showing good range of applicability.
• Thorough Preview: The tool provides an extensive preview of all OST file components for easy and sufficient analysis.
• User-friendly Interface: The software possesses an intuitive interface that caters well to users at all skill levels.

56.2 Cons

• No Search Functionality: The software doesn’t provide an advanced search feature, making it tougher to locate specific data in bulky OST files.
• Export Limitations: Despite its robust viewing offerings, it doesn’t have the capacity to export the OST file data to other file formats.

57. GoldFynch PST viewer

The GoldFynch PST Viewer is a tool designed to extract and analyse PST files seamlessly. Its cloud-based functionality assists in managing large volumes of data, providing an efficient solution for professionals who are constantly on the go. The tool maintains integrity of data, while also supporting advanced text searches.

57.1 Pros

• Cloud-Based Functionality: As a cloud-based tool, it eliminates the need for any software installation, making it accessible from any device with an internet connection.
• Data Integrity: It maintains the original structure and metadata of the PST files, which ensures the reliability of the data.
• Advanced Text Search: Its advanced search feature enables users to efficiently navigate through large sets of data.

57.2 Cons

• Internet Dependent: Being a cloud-based tool means you always need to have a reliable internet connection to access your files.
• No Support for OST Files: Unfortunately, the tool only supports PST files, thus limiting its usefulness if you also work with OST files.
• Long Processing Time: The tool can sometimes take a while to load large PST files, which can be a hindrance during time-sensitive operations.

58. Revove Forensics Solution for Outlook OST File

Revove Forensics Solution for Outlook OST files is a comprehensive tool designed to analyse OST files in depth. This solution is widely used for forensic analysis and investigations due to its advanced data sorting and search capabilities. It supports all formats of OST files and ensures data integrity.

58.1 Pros

• Advanced Data Sorting: This tool allows for sophisticated data sorting which makes it easier to organise and comprehend email content, which is particularly useful during forensic investigations.
• Supports All Formats: Unlike some other tools, Revove Forensics supports all types of OST file formats, swiftly managing data regardless of size or complexity.
• Data Integrity: The tool is designed to protect your data and maintain its original structure and metadata, ensuring the reliability and authenticity of the information.

58.2 Cons

• Technical Complexity: The tool comes with numerous features that may be overwhelming and complicated for non-technical users.
• Premium Pricing: Despite its extensive capabilities, the higher pricing might be a hurdle for users working with limited budgets.

59. Conholdate Online OST Viewer

Conholdate Online OST Viewer is a user-friendly and cloud-based tool renowned for its simplicity and efficiency. It enables users to view OST files online without needing to install MS Outlook. Its wide range of compatibility allows it to successfully open and read OST files from all versions of MS Outlook.

59.1 Pros

• Easy to Use: Conholdate’s interface is intuitive and straightforward, making it an excellent choice for users who aren’t technically savvy.
• Cloud-Based: The cloud-based functionality removes the need for software installation and enables users to access their files anytime, anywhere.
• Compatibility: The tool can open and read OST files from any versions of MS Outlook, giving it wide usability.

59.2 Cons

• Internet Dependence: Since it’s a cloud-based tool, a stable internet connection is mandatory for its operation.
• Limited Features: Compared to more full-fledged tools, Conholdate offers relatively less features, especially for professional use.
• File Size Limits: The tool also comes with certain restrictions on the size of the OST file that can be viewed.

60. Conholdate View OST File Online Or Via C# .NET

This edition of Conholdate’s OST viewer, aside from the usual online functionality, also provides the flexibility of integration with C# .NET applications. It’s a comprehensive solution that enables you to view, convert, annotate, compare, and sign OST files not only in web applications but also in your C# .NET projects.

60.1 Pros

• Integration with C# .NET: Gives users the ability to view OST files directly within their C# .NET applications—an uncommon feature among OST viewers.
• Multiple Functionality: Aside from viewing, it allows for conversion, annotation, comparison, and digital signing of OST files.
• Wide Compatibility: Like its online counterpart, this version is compatible with all versions of MS Outlook OST files.

60.2 Cons

• Requires Coding Knowledge: The integration with C# .NET requires basic understanding of programming—a potential hurdle for non-technical users.
• Complexity: The multiple functions might seem overwhelming and add unnecessary complexity for users just looking to view OST files.
• Pricey: Given its multifunctionality and integration capabilities, this tool can be more expensive compared to basic OST viewers.

61. SysTools OST Viewer Tool

SysTools OST Viewer tool is a widely acclaimed application for viewing and reading OST files in a variety of conditions. One of the tool’s unique features is the ability to access and read damaged or corrupted OST files, in addition to viewing deleted items.

61.1 Pros

• Access to Corrupted Files: This tool offers a strong advantage by allowing you to view and read content in corrupted or damaged OST files, which many viewers don’t support.
• Preview of Deleted Items: An unusual feature of SysTools OST Viewer is that it provides a preview of deleted items from the OST file, giving users a comprehensive view of their data.
• Easy to Use: The interface is user-friendly, making it an accessible choice for users of all technical levels.

61.2 Cons

• No Editing Capability: While you can view and read OST files, this tool does not allow you to edit items, which might be a drawback for some users.
• Occasional Delays: Users have reported occasional delays while loading large OST files.
• Limited Features in Free Version: The free version of this tool has limited features—users need to purchase the full version to enjoy all benefits.

62. Sysinfo OST Viewer

Sysinfo OST Viewer is a highly admired tool for quick and easy viewing of OST files. It stands out with its unique capabilities to read and recover data from corrupted OST files. The tool’s intuitive interface and advanced search functionality amplifies productivity and efficiency when managing OST files.

62.1 Pros

• Recover Corrupted Files: It can access and recover data from corrupted OST files, which is a notable advantage.
• Advanced Search Functionality: The advanced search functionality makes it easier for users to locate specific files or items.
• User-Friendly Interface: The tool has an intuitive interface that simplifies navigation and usage for all kinds of users.

62.2 Cons

• No Editing or Saving: This tool allows viewing and recovering files but doesn’t support saving or editing the OST files.
• Slow Performance with Large Files: Users have reported slower performance when dealing with larger OST files.
• Limited Features in Free Version: While the free version allows viewing of OST files, other advanced features require purchase.

63. Sysinfo Linux OST Viewer

Sysinfo Linux OST Viewer is a peculiar application that facilitates the viewing of OST files on the Linux platform. It incorporates features primer for Linux users such as advanced search functionality and the capacity to recover data from damaged OST files.

63.1 Pros

• Designed for Linux Users: This software is specifically tailored to cater to the needs of Linux users, a demographic often overlooked by similar tools.
• Data Recovery: Similar to other Sysinfo offerings, this tool can recover data from corrupted OST files.
• Advanced Search Functionality: It includes a robust search function that allows users to locate specific files within the OST files easily.

63.2 Cons

• No Editing: While the tool allows for viewing and recovering OST files, it offers no capabilities for editing these files.
• Compatibility Issues: Being a Linux-specific tool, it’s not compatible with other widely-used operating systems like Windows or macOS.
• Slow with Large Files: Performance may lag when dealing with larger OST files.

64. Summary

64.1 Overall Comparison Table

Tool	Features	Ease of Use	Price	Customer Support
Betavare OST Viewer	View OST Files	High	Free	Low
KDETools OST Viewer	View OST files, show deleted items	High	Free	Medium
MailsDaddy OST Viewer	View OST files	High	Free	Low
Mail Backup X	Backup, archive, conversion, recovery	Medium	Paid	High
BitRecover OST Viewer	View OST files, read encrypted files	High	Free	Medium
Aryson OST Viewer	View OST files	High	Free	Low
Softaken OST Viewer	View OST files	High	Free	Medium
eSoftTools OST Viewer	View OST files	High	Free	Medium
USLSoftware OST Extractor PRO	Conversion features	High	Paid	High
ZOOK OST Viewer	View OST files, preview feature	High	Free	Medium
PST Walker OST PST Viewer	Dual file support, embedded image extraction	Medium	Paid	High
CoolUtils Outlook Viewer	Limited	High	Free	Good
GainTools OST Viewer	Medium	High	Free Version Available	Good
PCVITA OST File Viewer	Medium	Medium	Free	Average
Recoveryfix OST Viewer	Medium	High	Free	Good
PC Info Tools OST Viewer	Medium	High	Free	Average
MacSonik OST Viewer Mac	Medium	High	Paid	Good
MacUncle PST to MSG Converter	Medium	Medium	Paid	Average
MailConverterTools OST Viewer	Medium	High	Free	Good
FreeViewer OST Viewer	Medium	High	Free	Good
DRS OST Viewer	Medium	High	Free	Good
SysInspire OST File Recovery Software	High	Medium	Paid	Good
Kernel OST Viewer	Advanced Search, Data Integrity, No Exchange Server needed	High	Free with premium version available	Available
Cigati OST Viewer	Encrypted Files Support, Smart Preview, High Compatibility	High	Free with premium upgrade	Available
Turgs OST Viewer	Large File Support, Encrypted Files Support, User-friendly Interface	High	Free with premium upgrade	Available
EmailDoctor OST Viewer	Large OST Files Handling, Access to Comprehensive OST Data	High	Free with premium upgrade	Available
RecoveryTools OST Viewer	Large File Support, Comprehensive Viewing, Corrupt File Handling	Medium	Free	Available
EdbMails OST Viewer	Corrupt File Support, Data Integrity, Comprehensive Data Viewing	Medium	Free	Available
SysData OST Converter	Conversion Capabilities, Recover of Deleted Items	High	Free with premium upgrade	Available
BitVare OST Viewer	Multiple File Support, Comprehensive Data Viewing	High	Free	Available
SysKare OST Viewer	Data Integrity, Comprehensive Viewing	High	Free	Available
Recovery Toolbox OST Viewer	Corrupt File Repair, Comprehensive Data Viewing	Medium	Free with premium upgrade	Available
XstReader	Open-Source, Customizable, Exchange Server Independent	Medium (High for developers)	Free	Community-based
Stellar Viewer for OST	Viewing OST files, Supports encrypted files	High	Free, Paid Upgrade Available	Good
Stellar Converter for OST	OST to PST conversion, Supports large OST files	Medium	Paid	Good
Shoviv OST Viewer Tool	Viewing large OST files, Free to use	High	Free	Average
FileViewers OST File Viewer	Handles corrupted files, Preview feature	High	Free	Good
Groupdocs View OST online	Online solution, Wide compatibility	High	Free	Average
4Team Corporation – OST PST Viewer	Dual Support, Advanced Search	Medium	Paid	Good
MailsSoftware Free OST Viewer	Advanced scanning, Free to use	High	Free	Average
Aspose OST Reader	Online solution, Wide compatibility	High	Free	Good
DataHelp OST Viewer Tool	Supports all types of OST files, Free of cost	High	Free	Average
Data Repair Tools Free OST Viewer	Supports Corrupted files, Freeware	High	Free	Good
MS Outlook Help – OST File Opener	Reliable and safe, Views all data	High	Free	Good
FileProInfo OST Viewer	Detailed Preview, Data Integrity, Corrupted File Handling	Very Easy	Free	Good
OSTViewer – OST Viewer Tool	Damaged File Handling, Multifaceted Preview	Easy	Free	Average
Encryptomatic Ost/Pst Viewer Pro	Advanced Search, Convenient Organization, Bulk Handling	Moderate	Paid	Excellent
DataRecoveryFreeware OST Viewer Freeware	Encrypted File Support	Easy	Free	Good
Recovery-Tools OST Reader	Preview Options, File Flexibility	Easy	Free	Good
Convertertools OST File Viewer	Diverse File Support, Detailed Previews	Easy	Free	Average
DotStella OST File Viewer	Broad File Support, Detailed Preview	Easy	Free	Average
OST2PSTware OST Viewer	Compatibility	Easy	Free	Average
Forensicware Outlook OST Viewer	Robust Design, Detailed Outlook	Easy	Free	Good
Acquire Forensics OST File Viewer	Broad File Support, Thorough Preview	Easy	Free	Good
GoldFynch PST viewer	Cloud-Based, Data Integrity, Advanced Text Search	High	Medium	Moderate
Revove Forensics Solution	Advanced Data Sorting, Supports All Formats, Data Integrity	Moderate	High	High
Conholdate Online OST Viewer	Easy to Use, Cloud-Based, Wide Compatibility	High	Medium	High
Conholdate View OST via C# .NET	Integration with C# .NET, Multiple Functionality, Wide Compatibility	Low	High	Moderate
SysTools OST Viewer Tool	Access to Corrupted Files, Preview of Deleted Items, Easy to Use	High	Medium	High
Sysinfo OST Viewer	Recover Corrupted Files, Advanced Search Functionality, User-Friendly Interface	High	Medium	High
Sysinfo Linux OST Viewer	Designed for Linux Users, Data Recovery, Advanced Search Functionality	High	Medium	Moderate

64.2 Recommended Tool Based on Various Needs

Given the diverse needs of users, our final recommendations are as follows:

For a completely free and simple solution, Betavare OST Viewer and MailsDaddy OST Viewer provide great value. These tools offer the core functionality of viewing OST files and have very intuitive user interfaces.

If your needs extend to backup, archive, recovery, and conversion, Mail Backup X and USLSoftware OST Extractor PRO should be your go-to options. It should be noted that these are paid tools.

If you are looking for a software that supports both OST and PST files, PST Walker OST PST Viewer is ideal, notwithstanding it being a paid tool.

65. Conclusion

Choosing an OST viewer tool largely depends on your individual needs, preferences, and the budget you’re willing to allocate towards it. Free tools like Betavare OST Viewer and MailsDaddy OST Viewer offer you core functionalities and are great for users on a budget. On the other hand, paid tools like Mail Backup X and USLSoftware OST Extractor PRO provide additional functions such as backup, archiving, and recovery.

If your work involves dealing with both OST and PST files, investing in a versatile tool like PST Walker OST PST Viewer would be beneficial. Therefore, the important takeaway is understanding your prime requirements and choosing an OST Viewer aligning with them for a fulfilling and efficient user experience.

Author Introduction:

Vera Chen is a data recovery expert in DataNumen, which provides a wide range of products, including PSD recovery product.