Why DataNumen Exchange Recovery?

#1 Recovery
Rate

10+ Million
Users

20+ years of
experience

100% Satisfaction
Guarantee

Recover Much More than Our Competitors

Recovery rate is the most important criterion of an OST recovery and OST to PST conversion product. 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

Our Customers' Testimonials

DataNumen Exchange Recovery

Congrats!

Your Exchange recovery software is amazing and works like a champ. Thank you.

Erwin W.

May 9th, 2020

DataNumen Exchange Recovery

DataNumen tool worked perfectly, did the task I needed it to do. A+ Product thank you.

Seth L

May 9th, 2020

DataNumen Exchange Recovery

I would like to thank you very much for making it possible to recover an email box that you already consider lost, with DataNume Exchange Recovery

... Read more

I would like to thank you very much for making it possible to recover an email box that you already consider lost, with DataNume Exchange Recovery software.

Congratulations to DataNumen Team!

 

Nelson d'Avila

February 16th, 2020

DataNumen Exchange Recovery

I just wanted to say thank you for providing this program. I just used it to successfully convert a large OST file which is allowing me to recover

... Read more

I just wanted to say thank you for providing this program. I just used it to successfully convert a large OST file which is allowing me to recover 150 emails that went missing.

It did a great job, and I'm super happy.

Thank you very much. I hope you have a most excellent day, and an outstanding weekend!!

Christopher Baber

Asheville, NC
May 10, 2019

DataNumen Exchange Recovery

By the way, we appreciate a lot your help. We made the decision of buying Datanumen Exchange Recovery tool yesterday, and one of the things we based

... Read more

By the way, we appreciate a lot your help. We made the decision of buying Datanumen Exchange Recovery tool yesterday, and one of the things we based our decision was the excellent technical service that you provided while we were testing.

Daniel Navarro

April 29, 2019

DataNumen Exchange Recovery

Hi Team

This tool was so helpful! I've tried other similar software but this one does the trick for recovering ALL my e-mails from OST file.

Genrev

May 20, 2019

DataNumen Exchange Recovery

I just wanted to say you guys are the best...

You are very appreciated! Now i can get my calendar info from an incorrecty setup OST (should have

... Read more

I just wanted to say you guys are the best...

You are very appreciated! Now i can get my calendar info from an incorrecty setup OST (should have had calendar info split into a pst instead of included in ost)

Thanks again and have a great day!

Gene Rovinsky

April 5, 2019

DataNumen Exchange Recovery

You are save my day. Anything I needed - just to convert 2 OST files. Only your program do this. Thanks a lot!

Ilya Sevryukov

Moscow, Russia
April 29, 2019

DataNumen Exchange Recovery

This is a great piece of software. It recovered a broken OST file first time and it then opened first time in Outlook 2019. I had tried 3 other

... Read more

This is a great piece of software. It recovered a broken OST file first time and it then opened first time in Outlook 2019. I had tried 3 other pieces of repair software without success and was about to accept the old mail had been lost. Thanks heaps DataNumen! 😊

Peter Keating
ex CIO, now retired

Melbourne, Australia
July 15, 2019

DataNumen Exchange Recovery

Your product did all that it was supposed to do. Recovering my email data file saved me.

I will be recommending your product to anyone who needs

... Read more

Your product did all that it was supposed to do. Recovering my email data file saved me.

I will be recommending your product to anyone who needs it, and for sure if i need it, i will re-install it.

Excellent product.

Alasmarh

December 26, 2019

DataNumen Exchange Recovery

After the replacement of my personal PC, I needed to recover for personal use the old UST file converting it to PST. Among a lot of softwares, I have

... Read more

After the replacement of my personal PC, I needed to recover for personal use the old UST file converting it to PST. Among a lot of softwares, I have found DEXR.EXE that fitted exactly my purpose. Whilst the UI looks very simple, DEXR was able to recover all my emails, contacts and contact groups with no errors. I well keep in mind DATANUMEN for the future as a reference Brand for data recovery.

Roberto Baldassar

Italy
March 7, 2020

DataNumen Exchange Recovery

After over 10 hours of active time wasted to educate MS on what the problem is when I upgraded my Outlook 2010 to 2013 and the autogeneration of

... Read more

After over 10 hours of active time wasted to educate MS on what the problem is when I upgraded my Outlook 2010 to 2013 and the autogeneration of mutiple .ost files I finally gave up. when they told me they cannot open the original .ost file. I then got the bright idea to do a quick search on .ost to .pst conversion and boom - 3.8GB of data that was very valuable to me was back in my hands - all this after MS top tier support for Outlook said they couldn't do anything. I am far from a computer geek but when you know more than the tech support rep you should figure out quickly that you are in trouble. It works...

RJ Collins Founder V360

San Diego, CA, USA
May 15th, 2015

Extremely Simple Interface

screenshot

Recovery

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Batch Recovery

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Options

Solution for Following Common Errors and Problems in Exchange OST File

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Main Features in DataNumen Exchange Recovery v8.6

  • Support Exchange 5.0 to 2019.
  • Support Outlook 97 to 2019 and Outlook for Office 365.
  • Support OST files created by Exchange ActiveSync.
  • Support for Windows 95/98/ME/NT/2000/XP/Visa/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 OST files. All properties, such as subject, to, from, cc, bcc, date, etc., are recovered.
  • Support to recover mail messages in plain text, 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 personal folders (PST) files that can easily be accessed by Microsoft Outlook and other compatible mail 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.
  • Support to convert OST to PST files fast and efficiently.
  • Support to recover oversized 2GB OST files.
  • Support to recover 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 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 to repair and convert OST files on corrupted media, such as floppy disks, Zip disks, CDROMs, etc.
  • Support to repair and convert a batch of 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 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 DataNumen Exchange Recovery to convert the OST files to PST files so that the data inside the files can be accessed in Microsoft 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 DataNumen Exchange Recovery to recover data from the OST files and convert them into PST format.

Start DataNumen Exchange Recovery.

DataNumen Exchange Recovery

Note: Before converting the 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 DataNumen Exchange Recovery will start converting from the source OST file to PST file. 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 DataNumen Exchange Recovery 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

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FAQFAQ
Help DocumentationHelp Documentation

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.

DataNumen Exchange Recovery 7.6 is released on October 31th, 2020

  • Improve the recovery rate.
  • Fix some minor bugs.

DataNumen Exchange Recovery 7.5 is released on August 19th, 2020

  • Improve the performance.
  • Improve the user interface.
  • Eliminate the useless items.
  • Fix some bugs.

DataNumen Exchange Recovery 7.2 is released on June 21th, 2020

  • Improve the compatibility of the 64bit version.
  • Fix some bugs.

DataNumen Exchange Recovery 7.1 is released on February 8th, 2020

  • Improve the recovery performance.
  • Improve the recovery rate.
  • Reduce the memory used in recovery process.
  • Fix some minor bugs.

DataNumen Exchange Recovery 6.9 is released on October 3th, 2019

  • Improve the search function.
  • Fix some minor bugs.

DataNumen Exchange Recovery 6.8 is released on July 8th, 2019

  • Eliminate the inconsistencies in the fixed PST file.
  • Redesign the batch recovery engine.
  • Support to save batch recovery log.
  • Fix some bugs.

DataNumen Exchange Recovery 6.5 is released on January 24th, 2019

  • Support Exchange Server 2019 and Outlook 2019.
  • Auto remove useless items.
  • Improve the recovery accuracy.
  • Improve the recovery speed.
  • Fix some bugs.

DataNumen Exchange Recovery 6.0 is released on November 12th, 2018

  • Improve the recovery for huge files.
  • Provide more controls on the recovery log.
  • Fix some bugs.

DataNumen Exchange Recovery 5.6 is released on September 21th, 2018

  • Improve the user interface.
  • Fix some bugs.

DataNumen Exchange Recovery 5.5 is released on April 28th, 2018

  • Support Exchange Server 2016, Outlook 2016 and Office 365.
  • Improve the performance of the 64bit version.
  • Fix some bugs.

DataNumen Exchange Recovery 5.0 is released on July 29th, 2015

  • Support 64bit Outlook.
  • Support to recover invalid data chunks.
  • Support to control whether to recover deleted, hidden or lost and found items.
  • Support to fix “Can’t move the items” error in OST files.

DataNumen Exchange Recovery 4.5 is released on June 12, 2014

  • Support to recover Outlook 2013 OST files.
  • Fix some bugs.

DataNumen Exchange Recovery 4.0 is released on April 29, 2014

  • 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).
  • Fix some bugs.

DataNumen Exchange Recovery 3.5 is released on January 20, 2014

  • Improve the recovery speed.
  • Reduce the memory consumption during recovery process.
  • Fix some bugs.

DataNumen Exchange Recovery 3.0 is released on August 12, 2010

  • Improve the performance of the recovery engine.
  • Improve the error detection and processing mechanism.
  • Improve the progress bar to reflect the recovery progress accurately.
  • Support Microsoft Exchange 2010 and Outlook 2010.
  • Fix some minor bugs.

DataNumen Exchange Recovery 2.5 is released on March 24, 2010

  • Improve the scan and recovery speed.
  • Reduce the memory consumption during the recovery process.
  • Prevent to recover duplicate contents in the recovery process.
  • Support to recover multiple properties of an object in batch.
  • Support to recover and convert multi-valued properties.
  • Improve the compatibility on Windows 9x systems.
  • Improve the compatibility of the GUI.
  • Fix some minor bugs.

DataNumen Exchange Recovery 2.0 is released on December 29, 2008

  • Rewrite the whole application.
  • Support Microsoft Windows Vista.
  • Support Microsoft Outlook 2007 and Exchange 2007.
  • Fix the bug in processing large messages.

DataNumen Exchange Recovery 1.1 is released on Nov 10th, 2006

  • Improve the accuracy of the recovery.
  • Support several advanced recovery methods.
  • Fix some minor bugs.

DataNumen Exchange Recovery 1.0 is released on January 1st, 2006

  • Powerful tool to recover orphaned or corrupt Microsoft Exchange offline storage (.ost) files

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