How do I Repair a corrupt OST file?

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If you have already tried fixing OST file using manual methods and or looking for an automated solution to repair corrupt OST file, then use Remo Repair Outlook. This OST Repair tool works with advanced Outlook data file repairing algorithms to easily fix your damaged, corrupt, or inaccessible OST file in simple clicks. Also, recover all your lost Outlook items including emails. Moreover, this tool is compatible with Office 365, Outlook 2019, 2016, 2013, and its previous versions.

OST file is known as the Offline Storage Table. It is used to compose emails, read existing emails, delete emails, set reminders, and many more in offline mode. And all the changes made to the OST file will be synced to the Exchange Server once the internet connectivity is accessible.

No matter how useful the OST file is, it is vulnerable to corruption. In case, if your OST file is corrupt and you are not able to access your email, then don’t worry! Here is a complete guide to repair your Outlook OST file using proven ways in simple clicks. 

How does the OST file get corrupt?

There are various ways through which your OST file can get corrupt. Some of the common reasons are as follows:

  1. OST file is infected by virus or malware attack
  2. Improper termination of Outlook
  3. Power surge issue while synchronizing Outlook data
  4. Oversized OST file
  5. Corruption or Bad sectors in the hard disk where OST file is saved
  6. Incompatible third-party Outlook add-ins

How to Repair OST file | (2019, 2016, 2013, 2010, 2007)

  1. Repair OST file using ScanPST
  2. Deleting and Recreating OST file
  3. Repair OST file using OST Repair tool
  4. Convert corrupt OST to healthy PST file

Method 1: Repair Corrupt OST file using ScanPST

ScanPST tool is an Outlook Inbox Repair tool used to fix corrupt OST file on any version of Outlook. Such as Outlook 2007, 2013, 2016, or 2019. 

  1. Locate and Open Scanpst.exe tool by utilizing the following path in your respective Outlook version.   
In Outlook 2019 C:\Program Files\Microsoft Office\root\Office16\
In Outlook 2016 C:\Program Files\Microsoft Office\Office16
In Outlook 2013 C:\Program Files\Microsoft Office\Office15
In Outlook 2010 C:\Program Files\Microsoft Office\Office14
In Outlook 2007 C:\Program Files (x86)\Microsoft Office\Office12

Note: If you are using Microsoft Outlook 2003 or its previous versions, then locate Scanost.exe tool.  

(Drive:\Program Files\Microsoft Office\Office_version)

Outlook 2000 C:Program Files\Common Files\System\MAPINT\scanost.exe
Outlook 2002 C:Program Files\Common Files\System\MAPI\scanost.exe
Outlook 2003 C:Program Files\Common Files\System\MSMAPI\scanost.exe

repair corrupt or damaged OST file

  1. Click the Browse button to select a corrupt OST file or Outlook Data File which you want to repair and then, hit the Start button.
    select corrupt OST file to repair
  2. Finally, Check or Tick Make a backup of scanned file before repairing option and hit the Repair button.

After the Outlook OST file repairing process completes, you can open Microsoft Outlook to access your OST file data such as emails, contacts, notes, etc. But, in some cases, you might need to perform some additional steps after repairing OST file to recover emails, contacts, and other Outlook items.

Steps to recover missing folders after running ScanPST

Once the SCANPST tool repairs your corrupt OST file, the Recovered Personal Folders or Lost and Found folder is automatically created. Under this folder, you can find all your missing Outlook items such as emails, notes, and many more. However, the main disadvantage of repairing your OST file using the scanpst.exe tool is that it cannot place the recovered Outlook items in their original folder structure. Follow the manual steps to recover Outlook folders or items from the Lost and Found folder to their original location.

  1. In the Folder pane, open the Recovered Personal Folders and Lost and Found folder.
  2. Select the Outlook folder or items you want to recover from it.
  3. Drag and drop the Outlook items into the original folders.

Now, you can delete the empty or unwanted folders created after repairing the OST file.

In case, if this method cannot fix OST file corruption then, head over to the next method as this can be due to severe OST file corruption.

Method 2: Fix OST file by Deleting and Recreating

Note: This method might lead to a data loss scenario if there is no proper synchronization exists between the Exchange server and the OST file. Hence, it is suggested to take a backup of your corrupt OST file before trying this method.

The technique of deleting and recreating the corrupt OST file can help you fix certain OST file errors due to corruption or damage and thereby you can access all your Outlook data. 

Steps to Delete and Recreate OST file

  1. Click Windows+R keys.
  2. Now, in the Open box option, Type or Paste %localappdata%\Microsoft\outlook and click OK.
    delete and recreate OST file to repair it

  3. This will locate all your available OST files on your Windows computer. Right-click on corrupt OST file and select Delete option.
  4. Now, open Microsoft Outlook to recreate a working OST file. 

In this way, you can recreate your OST file to fix OST file corruption and can access Outlook data. However, this method cannot restore Outlook folders or items like emails composed in offline mode if it was not synced with the Exchange server.

Method 3: Fix corrupt OST file using Outlook OST Repair tool

Utilize Remo Repair PST software which works with a read-only mode interface to safely fix corrupted OST and PST files created on any version of Outlook including Outlook 2019, 2016, and its previous versions. This Outlook OST repair tool takes only a few clicks to fix various errors or corruption related to your OST file. Also, it easily recovers missing or deleted Outlook items such as emails, attachments, contacts, events, folder structure, rules, and many more.

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  1. Download and install Remo Repair Outlook PST software on your Windows computer.
    Repair corrupt OST file
  2. Launch the OST Repair tool and select any one of the three options from the main screen based on your choice and click Next
  • Open Default PST File: Select this option if the corrupt OST file is located in the defined location.
  • Select PST File Manually: Select this option if you want to manually browse your corrupt Outlook OST file.
  • Find All Your PST Files: If you have multiple Outlook OST files use this option to locate all of them. And then, you can select the one which you want to repair.

select corrupt OST file

  1. Now, click the Smart Scan option. And select a destination of your choice to save your repaired OST file and click on the Repair button.
    Fix corrupt OST file
  2. After the corrupt OST file repairing process completes, check the destination location to view your repaired OST file.

Note: Do you know how to import your repaired OST file in Outlook? If not, then check out this article on how to import an OST file in Outlook.

Method 4: Repair OST file using Remo Convert OST to PST tool

Remo OST to PST Converter works with the advanced scanning technique to convert corrupt OST file into healthy PST file. And thus, it makes all Outlook items easily accessible.  

This method helps you recover all your OST file data such as emails, contacts, notes, and other Outlook items including Outlook folder structure and rules into PST file format. You can make use of this method especially if you want to transfer Outlook to new computer. Download Remo OST to PST converter tool now!

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  1. Download and install Remo Convert OST to PST software on your computer to repair Outlook OST file.
    repair OST file
  2. Click on the Find OST File button, this will automatically locate all available OST files. select the corrupt OST that needs to be repaired, and click Next.
  3. Now, click the Browse button to select the destination of your choice to save the converted OST file and then, click the Convert option.
    select destination for repaired ost file
  4. Finally, click the Finish button.

After you perform the above steps, the corrupt OST file will be converted into the PST file format. Now, you can easily import this PST file to access your Outlook data.


By making use of the in-built repair tool, you can fix minor OST file corruption. In cases, where the severity of corruption is high, make use of the Remo Convert OST to PST software to safely convert the corrupt OST file to PST format and access all your OST file data.

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Tony Landry

Tony Landry is a Web Content Editor at Remo Software. He loves to write, edit, and manage content for users trying to troubleshoot and fix problems on Windows, Outlook, storage drives and Cloud storage networks.

He has published more than 200 articles in Remo Software blog. He actively engages in research and problem-solving techniques to consistently generate great web content. Fixing various hardware problems on computer and storage devices along with a great knack for fixing Outlook errors, Tony is also the fun-time IT guy for all his work friends. He lives in the San Francisco Bay Area and enjoys cycling.

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