Why DataNumen Exchange Recovery?


#1 Recovery Rate

#1 Recovery
Rate

10+ Million Users

10+ Million
Users

20+ Years of Experience

20+ Years of
Experience

100% Satisfaction Guarantee

100% Satisfaction
Guarantee

Recover Much More than Our Competitors


Recovery rate is the most important criterion of an OST to PST converter tool. Based on our comprehensive tests, DataNumen Exchange Recovery has the best recovery rate, much more better than any other competitors in the market!

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Learn more about how DataNumen Exchange Recovery smokes the competition

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Extremely Simple Interface


Solution for Following Common Errors and Problems in Outlook OST File


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Main Features in DataNumen Exchange Recovery v8.6


  • Support Exchange 5.0 to 2019.
  • Support MS Outlook 97 to 2019 and Outlook for Office 365.
  • Support offline OST files for IMAP accounts(e.g. Outlook.com, GMail.com, Hotmail.com, etc.), Microsoft 365 accounts, and Exchange accounts.
  • Support to convert OST files created by Exchange ActiveSync.
  • Support for Windows 95/98/ME/NT/2000/XP/Vista/7/8/8.1/10 and Windows Server 2003/2008/2012/2016/2019. Both 32bit and 64bit operating systems are supported.
  • Support to recover mail messages, folders, posts, calendars, appointments, meeting requests, contacts, distribution lists, tasks, task requests, journals, and notes in Outlook OST files. All properties, such as subject, to, from, cc, bcc, date, etc., are recovered.
  • Support to recover mail messages in plain text(TXT), RTF, and HTML format.
  • Support to recover attachments, including the documents and images attached to messages and embedded in HTML bodies.
  • Support to recover embedded objects, such as another message, Excel Worksheets, Word documents, etc.
  • The recovered items are saved and converted to PST file format that can easily be accessed by Microsoft Outlook and other compatible email clients.
  • Support to recover deleted items in Exchange mailbox, including mail messages, folders, posts, calendars, appointments, meeting requests, contacts, distribution lists, tasks, task requests, journals and notes.
  • Powerful OST to PST converter tool.
  • Support to recover oversized 2GB OST files.
  • Support to recover and convert corrupted OST files as large as 16777216 TB (i.e. 17179869184 GB).
  • Support to split the output PST file into several small files.
  • Support to recover password protected Exchange OST files, both compressible encryption and high encryption(or best encryption) are supported. The OST file can be recovered even if you don't have the password.
  • Support to generate fixed PST file in Outlook 97-2002 format, Outlook 2003-2019 format, and Outlook for Office 365 format.
  • Support to recover OST file data from undamaged or damaged VMWare VMDK(Virtual Machine Disk) files(*.vmdk), Virtual PC VHD(Virtual Hard Disk) files(*.vhd), Acronis True Image files(*.tib), Norton Ghost files(*.gho, *.v2i), Windows NTBackup files(*.bkf), ISO image files(*.iso), Disk image files(*.img), CD/DVD image files(*.bin), Alcohol 120% Mirror Disk File(MDF) files(*.mdf) and Nero image files(*.nrg).
  • Support conversion of OST files on corrupted media, such as floppy disks, Zip disks, CDROMs, etc.
  • Support to repair and convert a batch of corrupt OST files.
  • Support to find and select the OST files to be repaired on the client computer.
  • Support to save the recovered PST file at any location, including the network attached drives recognized by the local computer.
  • Can be used as a computer forensic tool and electronic discovery (or e-discovery, eDiscovery) tool.
  • Support integration with Windows Explorer, so you can repair an Outlook OST file with the context menu of Windows Explorer easily.
  • Support drag & drop operation.
  • Support command line (DOS prompt) parameters.

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Using DataNumen Exchange Recovery to Convert OST to PST Files


See Video Tutorial (Full Version)
See Video Tutorial (Demo Version)

When disaster occurs on Microsoft Exchange server, such as server crashes, server database corruption, etc., the Exchange offline folder (.ost) files on the client computer still contain the mail messages and all other items of your Exchange mail account. You can use our OST to PST converter software to convert OST files to PST files so that the mailbox data inside the files can be accessed in MS Outlook.

Moreover, when you encounter various errors and problems with OST files, such as data corruption, synchronization errors, deleting emails by mistake, oversized 2GB OST file problem, etc., you can always use our conversion tool to recover data from the OST files and convert them into PST file format.

Start DataNumen Exchange Recovery.

DataNumen Exchange Recovery

Note: Before converting the Outlook OST file with DataNumen Exchange Recovery, please close any other applications that may access or modify the OST file. Also please close Microsoft Outlook.

Select the OST file to be converted:

Select Source File

You can input the OST file name directly or click the Browse button to browse and select the file. You may also click the Find button to find the OST file to be converted on the local computer.

If you know the Outlook version of the source OST file to be repaired, then you can specify it in the combo box Select Format beside the source file edit box, possible formats are Outlook 97-2002, Outlook 2003-2010, and Outlook 2013-2019/Office 365. If you leave the format as "Auto Determined", then DataNumen Exchange Recovery will scan the source OST file to determine its format automatically. However, this will take additional time.

DataNumen Exchange Recovery will save the converted data as a new file in Outlook PST format so that you can use Microsoft Outlook to open and see the converted objects. And by default, the new file name is xxxx_recovered.pst, where xxxx is the name of the source OST file. For example, for source OST file Source.ost, the default converted file will be Source_recovered.pst. If you want to use another name, then please select or set it accordingly:

Select Destination File

You can input the converted file name directly or click the Browse button to browse and select the converted file.

You can select the format of the converted PST file in the combo box Select Format beside the converted file edit box , possible formats are Outlook 97-2002 and Outlook 2003-2019/Office 365. If you leave the format as "Auto Determined", then DataNumen Exchange Recovery will generate the converted PST file compatible with the Outlook installed on the local computer.

Click the Start Recovery button, and our OST converter tool will start the OST to PST conversion process. Progress bar

Progress Bar

will indicate the conversion progress.

After the conversion process, if any data can be converted successfully, you will see a message box like this:

Success Message Box

Now you can open the converted PST file with Microsoft Outlook and see the converted objects. Please note our OST to PST converter software will try to put the converted objects in their original folders. However, for the lost & found objects, they will be recovered and put in special folders like Recovered_Group1, Recovered_Group2, etc.

More Information


DataNumen Exchange Recovery 8.6 is released on July 30, 2021

  • Support Turkish.
  • Fix some minor bugs.

DataNumen Exchange Recovery 8.5 is released on January 28th, 2021

  • Spanish, French, German, Italian, Portuguese, Russian, Japanese, Korean and Simplified Chinese.
  • Fix some minor bugs.

DataNumen Exchange Recovery 7.8 is released on December 10th, 2020

  • Auto check product updates.
  • Auto upgrade to the latest version.
  • Fix some minor bugs.

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What is the difference between PST and OST files?

PST (Outlook Data File) stores the mailbox contents on your local computer, for POP accounts.

OST (Offline Outlook Data File) stores a synchronized copy of the mailbox contents on your local computer, for most other account types, such as IMAP accounts(e.g. Outlook.com, GMail.com, Hotmail.com, etc.), Microsoft 365 accounts, and Exchange accounts.

How to open or import OST files in Outlook?

MS Outlook cannot open or import OST files directly. To access the mailbox data inside an offline OST file, you need to use our OST to PST converter to perform the conversion of OST files to PST files, and then open or import the PST files in Outlook.

Why do I need to convert OST file to PST file format?

There are many cases you need to perform the conversion, including:

  1. MS Exchange server crashes due to various reasons.
  2. The Exchange mailbox becomes inactive and you need to access the orphaned OST file.
  3. You cannot connect to the Exchange server, such as system maintenance, downtime, dismission, etc.
  4. Recover deleted emails from the Outlook OST file.
  5. Open or access the OST file data from another Outlook profile.
  6. Data migration from one computer to another.
  7. You are using an old version of Outlook and the OST file size reaches 2GB limit.

Use OST to PST converter, you can access the OST mailbox data directly in Outlook.

Is there a free way to convert OST file to PST format?

Yes, if you can still access the mailbox data in the OST file, then you can use the manual method to export OST file to PST file, as follows:

    1. Start Outlook.
    2. Click File > Open & Export.
    3. Click the Import/Export option.
    4. In the Import and Export Wizard dialog box, choose Export to a file and click Next.
    5. Select Outlook Data File (.pst) as the file type and click Next.
    6. Select the folder to export from, and make sure Include subfolders is checked. Then click Next.
    7. Set the path of the output PST file.
    8. Click Finish.
    9. If the Outlook PST file does not exist, Outlook will create a new one. It will pop up a dialog box asking you to input the optional password for the new PST file. Just leave it empty and click the OK button.

Then Outlook will export the OST file to the PST file, which can be opened or imported from Outlook later. However, if you are unable to access the orphaned OST file, then you need to use our conversion tool to do the task.

Does your tool need to connect to the Exchange server to convert OST to PST file?

No. It does not need to connect to the Exchange server to perform the OST to PST conversion.

What are the advantages of your tool over other OST to PST converters?

Our tool has the best recovery rate and the most comprehensive features among all the OST to PST converters in the industry. You can see the comparison between it and other competitors.

Can your software convert OST emails to .msg files?

Each MSG file stored only one email. It is called Outlook Message Format. It has two variants, i.e., non-Unicode format and Unicode format. Both will use .msg as the file extension.

If you want to export emails in an offline OST file as .msg files, please do as follows:

  1. Convert the OST file to a PST file via our file converter.
  2. Start Outlook.
  3. Open the PST file in Outlook.
  4. Double-click to open the email you want to convert.
  5. Click File -> Save to save the email as an Outlook Message Format or Outlook Message Format – Unicode.
  6. Repeat steps 1 to 5 for all OST emails you want to export as .msg files.

Can your software CONVERT OST emails to .eml/.XML files?

Each EML file stores only one email. The email contents are saved as Internet Message Format.

XML(Extensible Markup Language) file can also be used to store an email.

If you want to export all emails in an offline OST file as .eml/.xml files, you need to do as follows:

  1. Export the wanted emails to .msg format. Both non-Unicode and Unicode formats are OK.
  2. Based on the bitness of your Outlook, download the corresponding version of MFCMAPI. For the 32bit version of Outlook, you need to download the one without the x64 tag. And for the 64bit version, you need to download the one with the x64 tag.
  3. Start MFCMAPI.
  4. Click Advanced -> Import/Export -> Convert MSG to EML or Convert MSG to XML to convert to .eml/.xml format.
  5. Keep all the default values, click the OK button.
  6. Select the .msg file you saved in step 1.
  7. Set the .eml/.xml file name and location, then click Save.
  8. Now you have successfully saved one email in .eml/.xml format.
  9. Repeat step 1 to 8 for all emails you want to export as .eml/.xml files.

Can your tool convert OST mailbox to MBOX format?

MBOX format just concatenates all messages in plain text format. You can do as follows to convert OST mailbox to MBOX format:

  1. Use our file converter to convert the Exchange OST file to PST file format.
  2. Use an email client Thunderbird to import the PST file and convert it to MBOX format.

Can your tool convert OST contacts to vCard files?

vCard file is also called Virtual Contact File(VCF) file. It is the standard for electronic business cards.

To convert OST contacts to vCard files, please do as follows:

  1. Convert the OST file to a PST file via our tool.
  2. Start Outlook.
  3. Open the PST file in Outlook.
  4. Double-click to open the contact you want to convert.
  5. Click File -> Save to save the contact as vCard files (*.vcf) format.
  6. Repeat steps 1 to 5 for all OST contacts you want to export as .vcf files.

How long will it take to complete the conversion process?

This depends on many factors, including:

  • Outlook OST file size.
  • The number of items in the OST file.
  • The complexity of the OST file.
  • The performance of your computer system.

Normally for a 10GB OST file, it will take about 2 to 3 hours to convert it to a PST file on a 64bit modern computer.

Can your tool recover corrupt OST files?

Yes, our tool can recover data from corrupt or damaged OST files and output them into a PST file.

Are there any data losses during the conversion process?

If your OST file is not corrupt, then there will be no data loss. All the items in the original OST file will be converted and saved into the new PST file. If your OST file is corrupt, then all unaffected data can be converted. For the affected data, they will also be recovered in the maximum possibility.

What is the difference between the free demo version and the full version?

The free demo version and the full version use the same recovery engine, except the former will replace the message body with a brief demo text.

Which versions of Windows are supported?

Currently, our OST converter tool supports all Windows OS versions, including Windows 95/98/ME/NT/2000/XP/Vista/7/8/8.1/10 and Windows Server 2003/2008/2012/2016/2019. And it supports both 32bit and 64bit systems.

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