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Outlook data file (PST) is an essential part of Microsoft Outlook email client. PST files contain all your emails, contacts, calendar entries, appointments, journals, etc.; it means that they hold the entire MS Outlook items. These PST files are susceptible to corruption and can get corrupt at any point in time leading to the inaccessibility of Outlook emails and other mailbox items.

Instant Solution

Try automated tool Kernel for Outlook PST Repair to repair and resolve all Outlook PST corruption issues. It is compatible with all MS Outlook versions: Outlook 2019, 2016, 2013, 2010, 2007, 2003, 2002, and 2000.

Reasons for Outlook PST Corruption

Many reasons make your PST corrupt or damaged. Corrutpion reasons are classified into two main categories:

  1. Hardware Reasons
  2. Hardware Reasons
  3. Software Reasons

Hardware reasons: Failure of the storage device where PST file is saved, failure of networking device that is used to synchronize the file with the server through a network connection and power failure are some of the common hardware reasons that make your PST file data inaccessible.

  • Device Failure: PST files stored on the hard disk may get damaged when your disk gets corrupted.
  • Power Failure: Power failures and sudden systems causes sudden Outlook exits and leads to corruption of PST files.
  • Damaged network devices: When you have stored PST file over the network, network issues can corrupt PST files.

Software reasons: Logical corruption of PST file occurs if the file is opened and modified incorrectly, corruption of PST file due to virus or malicious software, abnormal termination of Outlook, 2 GB file size limitation in earlier version of Outlook are some of the software reasons that lead to PST file corruption and put you in a problematic situation.

  • Virus Attacks: Virus attacks damages whole system data including the PST files.
  • Improper system shutdowns: Improper and sudden system shutdowns will lead to Outlook issues and PST file damages.
  • Oversized PST files: When your PST file gets oversized, this will lead to PST corruption.
Methods to repair corrupted PST files

There are two methods to repair damaged and corrupted PST files.

  • ScanPST.exe (Inbox Repair Tool)
    Microsoft provides a free utility that can repair Outlook inbox and corrupted PST files so that you can use them again. However, the problem with this tool that it cannot repair harshly damaged and large PST. If your PST file is large and harshly damaged, then you have to use a third-party tool.

    repair Outlook inbox

  • Third party tool -Kernel for Outlook PST
    This utility scans the damaged and corrupted PST files and recovers the data. You can also export those PST files to Office 365, Exchange server, Domino server, and GroupWise. This tool repairs large and severely damaged PST files too. And, while repairing PST files, this PST repair tool ensures the security and integrity of the data. Also, this easy to use tool supports all the versions of MS Outlook and Windows OS.
  1. After installing the software, launch the tool on your desktop.
  2. Select the corrupt PST file from the welcome screen of the tool and click Next.Select the corrupt PST file
  3. Read the instructions for repairing the corrupt PST file and click Finish.
    repair corrupt PST file process finish
  4. After fixing the corrupt file, the PST file folders will be visible in the left pane of the tool. Select any folder to preview its content in the folder to save
  5. Now, click the Save button to save the PST file. Select the specific saving option to save the file and click PST file
  6. Apply the specific filters to the corrupt PST file based on your requirements and click Next.Apply the filters
  7. In the next step, if you want to split the PST file, then select the specific option from the drop-down menu and click Next.split the PST file
  8. Select the specific location to save the recovered PST file and click Finish.Select the location to save
  9. he tool will start saving the PST files. After the file saving process is complete, a notification will appear on the screen confirming the same. Click OK to end the process.Finish the process to save


In this blog, we discussed corruption in Outlook PST files. Like any other files, PST files are prone to corruption and may get corrupt at any point in time. We discussed what all could cause corruption in a PST file and quoted numerous reasons for the same so that it can be easily avoided in the future. A PST may get corrupt due to large size, virus attack, improper system shutdowns, and many other reasons. We then started providing the solutions for the issue. We provided manual approaches that can be used to fix the issue. Also, we mentioned an automated approach that can fix all Outlook PST file corruptions. Using Kernel for Outlook PST is the wisest option to fix corrupt PST files. Hope this blog helped you fix the issue.

Q. What issues in hardware can cause corruption of my PST files?

A. Scenarios like the abrupt shutdown of the system, power failures/fluctuations when the Outlook application was running, corruption in the hard disk, PST file stored on corrupt network drives, etc., can lead to corruption of the Outlook PST file.

Q. Can I repair my big PST file with the ScanPST.exe application easily?

A. The Inbox Repair tool or scanPST.exe application supports repair of PST file up to 2GB size only. For larger files, you can rely on Kernel for Outlook PST tool.

Q. What does the preview feature in the Outlook PST tool display?

A. The tool offers the preview of selected mailbox items and metadata.

Q. Any issue in saving multiple PST files together to the cloud via the Kernel tool?

A. Not at all. The tool supports saving multiple PST files together to Office 365 destination location with few steps only.

Q. Can I reduce my PST file size to fix its corruption issue?

A. Yes, sometimes it works. Just empty your deleted items folder, archive old emails, use the Compact Now feature in Outlook to compress the file size, move PST data to another location to free up storage space, and then try accessing it in the application to check if the problem is resolved.

Kernel for Outlook PST Repair