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Corrupted profiles often stop Outlook from launching properly. You may not expect this behavior, but the removal of the item is appropriate given credential loop in Microsoft 365 the circumstances. Also, this specific kind of situation is rare, and it will always be entered in the ScanPST log file.

Repair Outlook Data Files (.OST / .PST)

It is located in the folder of your original Personal Folders (.pst) file.Now, let’s discuss each manual and professional technique in more detail separately.If a Microsoft 365 application such as Word or Excel isn't working correctly, sometimes restarting it will fix the problem.ScanPST mostly validates and corrects errors in the internal data structures of a .pst file.If that block was part of a specific item in Outlook, the item will be removed when it is validated.This software is compatible with Outlook versions from 2021 all the way down to the lower versions.If you cannot import the Newname.pst file into Outlook, unfortunately you have lost all the information that is not in the Lost and Found folder.

If you could open the file, the following procedure may help you recover additional items from your damaged Personal Folders (.pst) file. In the Inbox Repair tool, type the path and the file name of your personal folders (.pst) file or select Browse to locate the file by using the Windows file system, and then Outlook Not Sending or Receiving Email select Start. Follow these steps to repair your Outlook personal folder file (.pst) by using Inbox Repair tool.

Understanding OST vs PST Files

This blog has discussed several methods that can help you repair corrupted Outlook PST files. You now have the opportunity to choose the method that best suits your needs, depending on your Outlook version. Moreover, the PST Repair Tool provides a range of features and filters that allow you to perform tasks according to your specific requirements. Additionally, It also fixes the Outlook Security certificate error issue and other errors. ScanPST mostly validates and corrects errors in the internal data structures of a .pst file. Therefore, structures such as BTrees and reference counts, are checked and repaired as necessary.

Repair Outlook Data File (.OST/.PST) to Fix Sync Errors Step-by-Step Guide 2025

If nothing works, your Outlook installation may be corrupted. If you use Exchange or Office 365, you can safely delete the .OST file; Outlook will recreate it from the server.

Common Causes of Outlook Data File Corruption

These low-level objects have no knowledge of the upper-level structures, such as messages, calendar items, and so on, that are built upon them. After you run the Inbox Repair tool, you can start Outlook and recover repaired items. Optionally, you can try to recover additional repaired items from the backup personal folder. Remember that the backup file was the original corrupted file, and you may find that you cannot recover anything other than what was recovered in the Lost and Found folder. If you cannot import the Newname.pst file into Outlook, unfortunately you have lost all the information that is not in the Lost and Found folder.

Why are Manual Techniques Unsuitable for Users

Repairing Outlook’s .OST and .PST files often restores full mailbox synchronization and prevents email loss. Always close Outlook properly, maintain smaller data files, and use the SCANPST tool or SaRA assistant for preventive maintenance. If errors persist, deleting the OST file or creating a new Outlook profile usually resolves all sync-related issues. If you could not open your original Personal Folders (.pst) file before Fix Outlook and Office 365 Errors 2025 you ran Inbox Repair Tool, the following procedures may not work. If it does not work, then unfortunately, you will be unable to recover any additional information.

Messages

No validation is explicitly done on body-related properties or on subject-related properties, except the implicit low-level validation that this article discusses earlier. The recipient display properties are changed to be consistent with the recovered recipient table. As soon as this operation is complete, other algorithms are run to collect all the orphaned messages and to put them in an Orphans folder. To start, create a new Personal Folders (.pst) file entry in your profile.