Solutions to Repair Corrupt OST File in Outlook

Read out this article to get the feasible native ways to perform the repair on the corrupt Offline Storage Table file or file with missing items.

What is the OST File?

OST – Offline Storage File is related to both Outlook and Exchange. OST file is the locally saved copy of Exchange Server mailbox data. Outlook users can work even offline through OST file and make changes as per their wish to emails which gets automatically updated while being connected with the Exchange Server. So, it is beneficial to access and modify Exchange data offline in Outlook when there is no internet connection.

Read also: Free Methods to Convert OST to PST File
Reasons for OST Corruption

An OST file does not get affected through Exchange database corruptions or other Exchange Server errors. However, the corruption source could be during the synchronization process of OST file with Exchange Server. Another issue with OST file could be the loss of some items during the synchronization process. Sometimes the OST file fails to connect or synchronize with the Exchange Server and become an orphaned OST file.

This calls for some feasible free solutions which would fix the corruption in the OST file. You can find these solutions free for use but these are only recommended for a trial. No reliability and data security is guaranteed for the native solutions. But, as mentioned, users can make trials to check if these solutions work for them or not.

Free Solutions to fix OST Corruption Issues

Perform the following native fixes in order to eliminate the corruption or repair the OST file.

A. In-built Repair Applications

Microsoft has provided two in-built repair applications, scanOST.exe and scanPST.exe.

scanOST.exe – It is an in-built application also known as Integrity Check tool to perform repair on the corrupt OST file. It supports Outlook 2007 and below versions only. The path location for this scanOST.exe is different for different Outlook versions and given as follows.

Outlook 2007: C:\Program Files\Microsoft Office\Office 12
Outlook 2003: C:\Program Files\Common Files\System\MSMAPI\scanost.exe

Let us know the process to repair OST file using scanOST.exe application stepwise.

  1. Locate the scanOST.exe application, right-click on it and select Run as administrator option.
  2. Provide the profile name for the corrupt OST file.
  3. Choose either Scan all folders option to scan all the folders of the mailbox or select individual folder as per your choice. Next, select the checkbox saying Repair errors and click on Begin Scan option to start the scanning and repair process. The scanning and repair process will start showing progress.
  4. After sometime, the repair process will get successfully completed. A message will be displayed for the successful repair. Click OK.
  5. Check if the OST file is working now or not.

scanPST.exe – It is the in-built utility by Microsoft known as Inbox Repair Tool to repair Outlook PST file of size up to 2GB with minor corruptions only. However, user can perform OST file repair of latest versions of Outlook also using this utility. This tool includes an option to take backup of their file before performing the repair. Though, many users complain that this exe does not work for the OST file well.

In that case, it is suggested to repair the Outlook program through Control Panel. by selecting the Microsoft Office program under Programs and Features section in Control Panel on your system and then clicking Uninstall option at the top bar. Finally select Repair option to start the repair process of this program. Check if it worked for you.

B. Generating New OST File

This method is recommended when the repair is not successful due to the in-built applications. It is not required to take backup of OST file before creating a new one as it is already a copy of the Exchange Server. But one thing must be ensured that the Exchange is well synchronized with Outlook without any interruptions like network issues throughout the process of regeneration. The process for recreating the new OST file is given as under:

  1. Close the running Outlook application first.
  2. Go to Control Panel of the system and click on Mail option.
  3. In the Mail Setup-Outlook dialogue box, click on Email accounts option.
  4. The Account Settings page will get open. Switch to Data Files tab and select the OST file from the accounts list. Then click on Open File location option.
  5. The OST file location is reached. Here, right-click on the OST file with .ost format and click on the Delete option to delete OST file. To delete it permanently, remove it from the Recycle Bin as well.
  6. Check whether Exchange Server is well connected. Now, open the Outlook application and the OST file will get automatically generated due to synchronization with Exchange Server.

Note: This OST regeneration method will work not work efficiently if the user has large mailbox size in Exchange Server or the internet connection is poor.

Hence, these were the native solutions which users can try for free. But, certain limitations like complexity, unreliability, risk of data loss or corruption, need of internet and server connection, etc. with these methods are inseparable. Moving to the alternative way, third-party tools is the best choice when none of the native solutions are working or its limitations are bothering you. OST to PST Converter tool is the most recommended software for the OST file recovery.

Download Now

It repairs OST file items with the most advanced algorithms used in programming of the tool. Advanced filters and simple GUI are its specialties. So, buy this tool once and just forget about any future OST corruption issues. If you want to get complete features knowledge and tool’s assessment, feel free to visit the online website.

Final Words

There are many free ways using which you can try to repair your corrupt OST file but all of it requires patience, efforts and sometimes luck. So, better be well prepared to deal with such nasty OST related errors or corruption by having a top-class, efficient Best OST to PST Converter tool as mentioned in the blog.


  1. I was facing an issue in accessing Microsoft Outlook application, then I came to know that the OST file is corrupted. I tried scanpst and scanost, the inbuilt utility to repair corrupt OST files etc. but all fails to restore data. Then I tried OST recovery tool to fix this corruption issue.

  2. I used the manual methods given in this blog to repair my OST files. The method is a little lengthy, but the author covers this blog in a straightforward manner that any user can understand. Thanks for this useful method.

  3. Very well-written and informative article. I tried the first methods to repair my OST file. Free methods are a little bit lengthy, but this blog describes all methods thoroughly and with images to assist users. Thank you for sharing this article.

  4. The article on OST repair is very well-written and informative. This blog helps me repair the OST files and explains the reasons for OST corruption. If you are also looking for a method to repair an OST file, check out this helpful blog. You can get a good result using these free methods.

  5. Corruption of OST files is a more common problem commonly experienced by many users. It is my personal experience that every free solution of any method needs your patience and focus. Just focus on using these techniques. Through the good advice in this post, I was able to successfully recover my corrupted OST files.

  6. My OST file has been corrupted and my friend suggest me to this blog. After following this method I successfully recovered my OST file. The author explains it very simply. Thanks for sharing this method.

  7. I used this manual method to repair my corrupted OST files.I used this manual method very well as mentioned by you and I have completely agreed with it because all my corrupted OST file dissoppinted me,but now i got a solutions from you and this is a well repaired uncorrupted fileThank you so Mach.

  8. I used this method to repair corrupt OST files. Every details elaborated by this blog was authentic. Along with this method I got OST files in better position as these are before. By inbuilt utility method I recovered OST files as in original formatting and structure. Thanks for explaining.

  9. In the search of manual method to solve an OST file corruption issue I found manual method so good. With this method I recovered and repair the OST file. Thanks for sharing above method.

  10. I used this blog method to retrieve OST files from corruption. These methods worked out for me. Thanks for sharing this useful method.

  11. My corrupted OST files are repaired by these methods very smoothly, but it’s taking much time and efforts. The author describes the methods in very common technical terms. The overall experience was very nice.

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