How to Repair Corrupted OST Files?

 

Repairing corrupted OST (Offline Storage Table) files in Microsoft Outlook can be a crucial task to restore access to your emails, contacts, and other data. Here’s a detailed guide on how to repair corrupted OST files:

 

1. Understanding OST Files

OST files are used by Microsoft Outlook to store a local copy of your mailbox data from an Exchange server. This allows you to access your emails and other data even when you are offline. However, these files can become corrupted due to various reasons such as abrupt shutdowns, network issues, or software conflicts.

 

2. Common Symptoms of Corruption

• Outlook fails to open or crashes frequently.

• Error messages indicate that the OST file cannot be accessed.

• Missing emails or folders.

• Synchronization issues with the Exchange server.

 

3. Methods to Repair Corrupted OST Files

Method 1: Using the Inbox Repair Tool (ScanPST.exe)

Microsoft provides a built-in tool called ScanPST.exe to repair OST files. Here’s how to use it:

 

1. Locate ScanPST.exe:

   • For Outlook 2019/2016: Navigate to C:\Program Files (x86)\Microsoft Office\root\Office16.

   • For Outlook 2013: Navigate to C:\Program Files (x86)\Microsoft Office\Office15.
     
     

2. Run ScanPST.exe:

   • Close Outlook.

   • Open ScanPST.exe.

   • Click on “Browse” and select the corrupted OST file.

   • Click on “Start” to begin the scan.

   • If errors are found, click on “Repair” to fix them.

 

Method 2: Recreating the OST File

If the Inbox Repair Tool doesn’t work, you can recreate the OST file:

 

1. Close Outlook.
   
   

2. Locate the OST file:

   • Navigate to `C:\Users

 

\[YourUsername]\AppData\Local\Microsoft\Outlook`.

 

1. Rename or Delete the OST file:

   • Rename the file (e.g., filename.ost.old) or delete it.
     
     

2. Reopen Outlook:

   • Outlook will automatically create a new OST file and synchronize with the Exchange server.

 

Method 3: Using Third-Party Tools

There are several third-party tools available that can repair corrupted OST files. Some popular ones include:

 

• Stellar Repair for Outlook: This tool can repair severely corrupted OST files and recover all mailbox items.
  
  

• Kernel for OST to PST Converter: This tool converts OST files to PST format, which can then be imported into Outlook.

 

4. Preventive Measures

To avoid future corruption of OST files, consider the following preventive measures:

 

• Regular Backups: Regularly back up your OST files to avoid data loss.
  
  

• Proper Shutdown: Always close Outlook properly before shutting down your computer.
  
  

• Update Software: Keep your Outlook and Windows updated to the latest versions.
  
  

• Use Reliable Network Connections: Ensure a stable network connection to avoid synchronization issues.

 

5. Additional Tips

• Check Disk for Errors: Sometimes, disk errors can cause OST file corruption. Run a disk check tool to ensure your hard drive is in good condition.
  
  

• Disable Add-ins: Some Outlook add-ins can cause issues with OST files. Try running Outlook in safe mode (outlook.exe /safe) to disable all add-ins and see if the problem persists.

 

Conclusion

Repairing corrupted OST files is essential to maintain access to your Outlook data. By using the built-in Inbox Repair Tool, recreating the OST file, or using third-party tools, you can effectively repair and recover your data. Additionally, taking preventive measures can help avoid future corruption and ensure the smooth functioning of your Outlook application.