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Microsoft Outlook repair tool

How to repair a corrupted Microsoft Outlook data files

Outlook Recovery Kit

Outlook Recovery Kit helps restore e-mails, appointments, attachments, contacts, tasks, notes, calendars, journals and other from damaged PST or OST files from Microsoft Outlook

How to repair Outlook storage

A step-by-step description of repairing data from corrupted Outlook Personal Store Folders. This instruction is suitable for any version and size of PST file of Microsoft Outlook:

  1. Download Outlook Recovery Kit here
  2. Install Outlook Recovery Kit in Windows
  3. Start Outlook Recovery Kit
  4. Select an PST file on the first page of the program
  5. Select the Recovery mode mode
  6. View the content of the PST file
  7. Select a folder for saving recovered data
  8. Select the Save as PST file mode
  9. Click Save
outlook repair

Outlook Recovery Kit checks the Outlook data files on your computer to see if they're in good shape. You might want to use the Outlook PST Repair tool in the following situations:

  • You receive a message that Outlook can't open your data file
  • You receive a message that Outlook can't open the set of folders
  • You think your Outlook data file may be damaged

Microsoft Outlook repair tool

Outlook Recovery Kit solves problems with corrupted Outlook storage files.

Outlook Recovery Kit includes online version here: The Outlook Online Repair Service allow to repair corrupted PST/OST files on any device (desktop, tablet, phone) with any OS (Windows, Android, macOS, iOS and so on). The Online PST Repair Service do not require installed Microsoft Outlook and do not need to install any third-part software on your device.

Features of Outlook file repair tool:

How to repair Outlook

The MS Outlook repair software helps to fix many Personal Store Folders errors:

  • Unable to open your default e-mail folders.
  • Errors have been detected in the file Outlook.pst. Close all mail enabled applications, and then use the Inbox Repair Tool.
  • Outlook.pst cannot be accessed - 0x80040116.
  • XXXXXXX.pst file could not be opened. The file may not be compatible with this version of Outlook or it may be corrupted.
  • OL2000: Unable to use your personal folder file if it exceeds the 2 GB size limit.
  • Unable to display the personal Outlook folder

If Microsoft Outlook cannot open your Personal Store Table (*PST file), download, install and start Outlook Recovery Kit. The MS Outlook PST repair tool will read and show the content of the corrupted PST file. You can use Outlook Recovery Kit in DEMO mode as a PST viewer. Our program doesn't use MS Outlook to repair Outlook data files.

Our PST repair tool can repair Outlook files of all versions. How to repair PST file in Outlook in few clicks? Outlook Recovery Kit can also fix 2GB error PST files. Later, you can divide a result file into several PST files, each being of a predetermined size.


  • Windows 98/Me/2000/XP/Vista/7/8/10/11 or Windows Server 2003/2008/2012/2016 and above
  • Microsoft Outlook 98, Microsoft Outlook 2000, Microsoft Outlook 2002, Microsoft Outlook 2003, Microsoft Outlook 2007, Microsoft Outlook 2010, Microsoft Outlook 2013, Microsoft Outlook 2016, Microsoft Outlook 2019, Microsoft Outlook 2021 (Microsoft 365) must be installed on the user’s computer at the time of conversion (excluding Outlook for Office 365, Outlook for iOS and Outlook for MacOS).

This product does not export contact groups.


Our engineers have analyzed the content of OST (source) and PST (destination) files. The analysis revealed the types of data that are not carried over to the PST file after OST file conversion:

  1. old versions of messages, contacts, files and other objects
  2. removed objects
  3. blocks of data from earlier versions of messages, contacts, files and other objects. It is impossible to use these blocks to fully recreate the original object, which is why they can be treated as junk.

In other words, when you remove or modify a message, contact, reminder or meeting, the object is only marked as removed, but is not removed physically and remains in the OST file. The new version of the object is written to a newly allocated space, but the old version remains in the OST file as well.

If Outlook is in active use, the size of the OST file can grow quite significantly, while the actual size of data in the file remains the same.

In order to optimize disk space consumption and remove old elements, you need to configure the AutoArchive feature in Microsoft Outlook.

Note: it is recommended to backtrack the changed options after the export of the recovered data in Microsoft Excel has been completed.
  • search for and reading of old versions of documents is used by attackers for stealing users’ confidential information;
  • search for and reading of deleted and old versions of documents is used by police authorities to collect compromising information (Forensic Mode);
  • Outlook Recovery Kit enables the user to search for data deleted from an OST/PST file and save it to the disk.


When converting large OST files (4 GB and above), you will have to use a 64-bit computer system. All program components required for converting OST to PST must be 64-bit. These include:

  1. Microsoft Outlook 64-bit
  2. Microsoft Windows 64-bit
  3. Outlook Recovery Kit versions 4.0 and above

This allows you to bypass the limitations on the RAM that can be used by each component and convert OST files of virtually any size.

Converting huge OST files to PST files

Once all necessary components have been installed, run Outlook Recovery Kit and perform the following actions:

  1. choose the OST file you need to convert on the program's first screen
  2. choose Convert on next page of Conversion Wizard
  3. choose the emails, contacts, and other information you want to transfer from the OST to the PST file
  4. choose the option to save as a PST file
  5. type or select a folder to use to save the data on the disk

The process of reading the OST file and then exporting it to PST takes a significant amount of time. The time it takes to convert OST to PST depends on your computer's performance, particularly the speed of your disk subsystem.

Note: When you install Microsoft Office or Microsoft Outlook, the 32-bit version is installed by default. To install Microsoft Outlook 64-bit, read the following article: How to Install Microsoft Outlook 64-bit?


To recover a very large Microsoft Outlook PST file (more than 4 GB), you'll need to have Outlook Recovery Kit installed on your computer, as well as the following:

  1. Microsoft Outlook 64-bit
  2. Microsoft Windows 64-bit

If this software is installed, Outlook Recovery Kit won't be limited to the size of operating data that 32-bit systems have. The program will be able to completely restore and save the data in a new PST file when working with the 64-bit versions of Microsoft Outlook and Microsoft Windows. If Microsoft Outlook 32-bit is installed on the computer, Outlook Recovery Kit will encounter a limitation due to the amount of RAM that can be used in the restoration of data.

If you have the installation disc or distribution kit, you can install Microsoft Outlook 64-bit along with the 32-bit version of Microsoft Outlook. You'll find instructions for the installation of Microsoft Outlook 64-bit here:


Instructions on how to install the 64-bit version of Microsoft Outlook

  1. To install Microsoft Outlook 64-bit, be sure you have the 64-bit version of Microsoft Windows installed
  2. Open the Microsoft Outlook install disc in Windows Explorer
  3. Open the Office folder
  4. Run the program setup64.exe
  5. Follow the installation instructions
Note: When Microsoft Outlook is installed, the 32-bit version is installed by default.


Please try the solution which is offered by Microsoft:

  1. Open the Start menu and click Control Panel.
  2. Browse to System and Security then click on System icon.
  3. In the left panel click on link Advanced system settings.
  4. You should now see the System Properties Window. Please select Advanced tab. You should see three sections. The top section is labeled Performance and has a Settings button. Click this button.
  5. Select the Data Execution Prevention tab.
  6. Select the option which reads Turn on DEP for all programs and services except those I select.
  7. Use the Add button to locate the executable file for the application executable file RecoveryToolboxForOutlook.exe you were trying to start when you received the error, and click Open to add it to your exceptions list.
  8. Click Apply or OK to commit your changes.


Can't view Contacts from new PST file in Microsoft Outlook 2003/2007. To view Contacts need to:

  • Turn on Navigate Pane in Microsoft Outlook by press Alt-F1 or select from main menu View | Navigate Pane.
  • Open new PST file from main menu File | Open | Outlook Data file...
  • Check item Contacts from Navigate Pane.
  • Select item Calendar in Personal Folders.


Afrer WAB recovery you got the set of Virtual Cards (vcf) files. You can use the Import function of MS Outlook to import the vcf files. To import them to MS Office Outlook you should:

  1. Run the MS Outlook
  2. Select menu File - Import and Export...
  3. Choose Import a VCARD file (.vcf) item and press Next
  4. Select VCARD files to import and press OK.


  1. Run the Outlook
  2. Open and select the Contacts folder
  3. Select .vcf file in Windows Explorer and drag-and-drop them to the Microsoft Outlook folder


Our software was developed for data recovery only. It can't recover records, statuses, etc.


Our software can recover data only from an existing file. You can try to restore your file with some unerasing software and then recover it with Outlook Recovery Kit.


Yes, but it needs space for temporary files. Free disk space should be 2 times greater than the size of the original .pst file being recovered.


Make sure you close Outlook before you start Outlook Recovery Kit. Try to download the newer version of our software and install it.

In some cases, you have to reinstall Microsoft Outlook and Outlook Recovery Kit because some components that are in use must be updated, but they cannot be released without reinstallation. Try to recover your data to separate files, it may help. Make sure you have enough free space on your storage drive to save recovered data. Do not try to save the file with results under the same name as that of the damaged file.

Try to recover data again.


You should send the log file of the program to our support service. The log file is located in the same folder where Recovery Toolbox for Oulook is installed (for example, D:\Program Files\Outlook Recovery Kit\Err.log).

Also, let us know the version of your OS (Operating System) and Outlook.


You can compress the log file using the WinRar program ( It will become smaller after that.


You should:

  1. Open Start | Settings | Control Panel | Mail
  2. Use the Delivery tab to select the corresponding PST file in the Deliver new mail to the following location: combo box and confirm moving the service folders (if necessary).

Thus, the new .pst file will be the file used in Outlook by default.


Messages saved as .eml files are imported into Microsoft Outlook in several steps. You should:

  1. Import .eml files into Outlook Express folders. To do it, you should open Outlook Express and Windows Explorer at the same time.
  2. Select .eml files in Windows Explorer using the Shift + arrow keys or the Ctrl key + the left mouse button.
  3. Use your mouse to drag the selected .eml files to the Outlook Express folder.
    Note: it is recommended to create a new folder in Outlook Express to import messages into.
  4. Open Microsoft Outlook 2000 and select the File | Import & Export item in the main menu of the program.
  5. Select the Import Internet Mail and Addresses item and click the Next button
  6. Select the Outlook Express 4.x, 5 item from the list, leave the Import Mail checkbox selected and click the Finish button


You should:

  1. Open the PST file in Microsoft Outlook
  2. Open the Calendar tab
  3. Select the option to display the calendar of Personal Folder

Now the calendar from saved PST file is also displayed.

Notes: Users of Microsoft Outlook earlier versions should:
  1. Open a new PST (Personal Store Folder) file in Microsoft Outlook.
  2. Expand the folders of the new PST file in the left panel and click the Calendar folder.
  3. Saved events from the new PST file will be displayed in the right panel.


You should:

  1. Open the PST file in Microsoft Outlook
  2. Open the Contacts tab
  3. Select the option to display the contacts of Personal Folder

Now the contacts from saved PST file is also displayed.

Notes: Users of Microsoft Outlook earlier versions should:
  1. Open a new PST (Personal Store Folder) file in Microsoft Outlook.
  2. Expand the folders of the new PST file in the left panel and click the Contacts folder.
  3. Saved events from the new PST file will be displayed in the right panel.


You should:

  1. Reboot your computer.
  2. Disable your antivirus, it can block access to the Outlook data for our program.
  3. Don't run the Outlook during and before recovery. If you choose to save data to new PST files, Outlook will start in hidden mode automatically.
  4. Try to make the recovery to separate files, not to PST.
  5. If you have another computer, please try to recover this file on it.
  6. Send to our technical support your original file for a recovery if my suggestions can't help.

You can create multi-volume archive from the orignal OST/PST file using WinRar program ( It is free trial. The size of each volume must be ~30-50Mb. And upload all files on service and send us the links to the all files.


This error occurs:

  • when Microsoft Outlook tries to open several Personal Store Folders that use one PST file
  • or if the Personal Store Folder is registered in Microsoft Outlook, but the original PST file does not exist on the disk or if the path to it is incorrect

To solve the problem, you should:

  1. Close Outlook Recovery Kit and Microsoft Outlook
  2. Restart the computer
  3. Start Microsoft Outlook. Ignore the message This Personal Folders file (pst) is already in use with this profile while restarting Microsoft Outlook.
  4. Close all PST files Personal Store Folders being used, except for the main Personal Store Folder in the left panel of Microsoft Outlook. To do it, you should right-click the Personal Store Folder item and select the Close Personal Store Folder item in the context menu.
  5. Close Microsoft Outlook
  6. Open Microsoft Outlook again. If the error message This Personal Folders file (pst) is already in use with this profile appears again, the path to the main Personal Store Folder is incorrect or the PST does not exist on the disk. To fix this error, you should:
    • Find the source PST files on the disk. The best way to do it is to use the Microsoft Windows search feature (click Start | Search | For Files and Folders...), select All files and folders (for Windows XP) and then search for *.pst files on the computer.
    • Set the correct path to the file and its name in the properties of the main Personal Store Folder (right-click the Personal Store Folder item and select the Properties item in the context menu).


Microsoft Outlook data files contain main objects ( messages, contacts, notes, reminders, attached files and others) and service objects that are not shown to the user. While writing the recovered data to the new .pst file, the program does not write some service objects because there is no need to do it.


You performed the recovery operation at another computer or where another version of Outlook is installed. Our software uses Outlook components to compile the structure of a new PST file(s). So the recovered PST file is compatible with the version of Outlook that is installed on the system where the PST file was recovered.


Cases differ. Our software requires that the damaged file is fully readable so if you can copy the file to a normal, not crashed hard drive, our software will probably help you. Please download our software and try it for free. If it can help in your case, you can purchase it to disable the trial limitations.


Every object saved by Outlook to a file is stored in several blocks of up to 512 bytes. When a message is deleted, these blocks are not deleted and remain in the file. However, when new emails are sent or received, these blocks may be overwritten. As a result, the deleted email can be recovered only partially, for example:

  • if there is a subject, the message body or attachments may be lost;
  • if the subject is lost but the body is there, the email will be restored without From and To fields;
  • if the message subject and body have been overwritten, the attachment will be saved as a standalone file;
  • and so forth.

Outlook Recovery Kit does everything possible to recover deleted data. If an object's data blocks are overwritten by Outlook, the object will be recovered only partially.


Repairing mailboxes after the corruption of the Exchange Server database file.

If the Exchange Server database file gets damaged, the server will still have *.edb files with users' emails. There will also be .ost files on users' computers containing the personal data of each user.

OST files can be quickly and easily converted to PST files using Outlook Recovery Kit.

You can try recovering .edb files using Exchange Server Recovery Kit. This tool converts individual mailboxes to .pst files.

We recommend trying both recovery methods to recover as much data as possible.


This OST-to-PST converter is an easy-to-use tool that operates like a wizard. With it, you can convert an .ost file to the .pst file format in a few simple steps. No special know-how is needed in order to use the Outlook Recovery Kit OST-to-PST converter.

Microsoft doesn't currently offer a special Outlook OST-to-PST converter. All OST2PST converters have been designed by ISVs. Outlook Recovery Kit, however, has a demo mode that lets you convert five objects per folder.


Outlook Recovery Kit can read *.ost files any versions of Microsoft Exchange Server, any version of Microsoft Outlook (32- or 64-bit, ANSI or UNICODE). Software can read and convert *.ost files with any size of file.


The size of the converted .pst file shows the actual size of information stored in the ost file. If you do not make archives and do not start Cleanup Tool regularly for the original Offline Storage Folders, then the .ost file size is only growing. As a result, only 5-10% of the file can be used for a real user's data.


For the use of OST-to-PST conversion on a computer running Microsoft Outlook, the .pst file version will be the same as that installed in Microsoft Outlook. If the computer has Microsoft Outlook 2007 or higher installed, the size of the resulting .pst file can exceed 2Gb. If you use MS Outlook 98-2003, the size of the resulting file will be limited to 2Gb. In this case, Outlook Recovery Kit will create several .pst files in which to store all the data from the source .ost file.


Outlook Recovery Kit exports messages, contacts, appointments and other data from *.ost files as MSG files. The software converts and saves all data from .ost files to the .msg file format. Later, the user can drag and drop or import the saved *.msg files in any of the popular client software programs, including Lotus Notes, Microsoft Live, The Bat, Eudora, Incredimail, Mozilla Thunderbird, etc.


Microsoft Outlook has no function with which to import data from *.ost files. To open an *.ost file in Outlook, the Exchange Server and Windows Domain Controller must be working and available for user authentication in both of the respective services. Only after that is it possible to transfer the contents of an .ost file that is open in Outlook to a .pst file that is also open in Outlook.

If the Exchange Server or Windows Domain Controller isn't accessible or doesn't work, or if the user can't be authenticated, access to the data will be denied and Outlook won't open the .ost file.


The original .ost file must be converted to a pst file using Outlook Recovery Kit and then opened in Outlook. Conversion from OST to PST using Outlook Recovery Kit doesn't require the availability of Exchange Server or Windows Domain Controller.


To correct the following issue 8004010F when using POP3/SMTP accounts in Microsoft Outlook, do the following:

  1. Download, install and start Outlook Recovery Kit from the site:
  2. Choose a corrupt .PST file in the first window
  3. Choose Recovery Mode
  4. Choose a folder to save a recovered file
  5. Replace the corrupt PST file by a recovered one

Last, you should replace the damaged file to a recovered one or merely add the recovered file to the list of data files in Outlook.


Follow the link and download Outlook Recovery Kit, the application is compatible with all versions of Outlook, including our new Outlook 2019. Then, install it and follow the instruction:

  1. Start Outlook Recovery Kit.
  2. Choose the needed file of PST format.
  3. Choose Rcovery mode.
  4. Start the analysis of the damaged file and wait until it is finished.
  5. Preview the contents of the repaired file.
  6. Choose a folder to save the repaired file.
  7. Choose Save as PST file.
  8. Click the Save button.

After a successful repair, you should properly connect a file of PST format to Outlook 2019:

  1. Open Outlook 2019 and choose File | Info.
  2. Click Account settings.
  3. Choose Account settings in the popup menu.
  4. Choose the following tab Data files.
  5. Choose a data file from the list below.
  6. Click Delete if the file is present.
  7. Click Add and provide the correct PST file path.
  8. Open Microsoft Outlook, try to send and receive your email.


If you’d like to update to Microsoft Outlook 2019 and you have already an older version of Outlook, for example, 2016/2013/2010/2007, and the like, I would advise the following:

  1. Make a backup copy of Outlook data files (files of .pst and/or .ost format)
  2. Remove Microsoft Office completely
  3. Make a new clean install of Microsoft Outlook to another folder. For this purpose, use the option of advanced installation and enter the installation path.
  4. Open the list of Outlook data files and add a previously saved PST file of the previous application version.

Please select a damaged Microsoft Outlook *.pst file:

Please select a mode for program use:

  • Recovery Mode – use it if you need to repair a damaged *.pst or *.ost file.
  • Converter Mode – use it for export data from OST to PST files.
  • Scan for deleted data – this is a search mode for deleted objects.

On the second page, the customer can view and select the recovered objects that are to be saved (emails, contacts, appointments and so on):

Please select a target folder for saving the recovered data to:

Please select the type of the recovered content that is to be saved:

Selecting the source *.pst file you want to repair

Select work Mode

Reading (detecting and recovering) data from the selected *.pst file

Specifying the path where to save the recovered data

Selecting the method of saving the recovered data

Saving the data to the disk