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DataNumen Exchange Recovery is the best OST to PST converter and OST recovery tool in the world. It can convert the orphaned or corrupt Outlook OST files to PST files for easy access.
Note: For Outlook PST file repair and recovery, please use DataNumen Outlook Repair.
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!
Learn more about how DataNumen Exchange Recovery smokes the competition
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.
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:
You can input the OST file name directly or click the button to browse and select the file. You may also click the
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 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:
You can input the converted file name directly or click the button to browse and select the converted file.
You can select the format of the converted PST file in the combo box 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 button, and our OST converter tool will start the OST to PST conversion process. 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:
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.
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.
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.
There are many cases you need to perform the conversion, including:
Use OST to PST converter, you can access the OST mailbox data directly in Outlook.
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:
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.
No. It does not need to connect to the Exchange server to perform the OST to PST conversion.
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.
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:
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:
MBOX format just concatenates all messages in plain text format. You can do as follows to convert OST mailbox to MBOX format:
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:
This depends on many factors, including:
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.
Yes, our tool can recover data from corrupt or damaged OST files and output them into a PST file.
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.
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.
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.