How Do I Fix a Corrupted OST File in Outlook?
If you want to fix a corrupted OST file in Outlook, I would suggest first trying the manual method by recreating the OST file. Close Outlook, locate the OST file on your system, rename or delete it, and then restart Outlook. Outlook will automatically create a new OST file and sync your mailbox data from the mail server.
If the OST file is severely corrupted, orphaned, or contains important offline data that cannot be resynced, then using the BLR OST Recovery tool would be a better option. It can help recover emails, contacts, calendars, and attachments from the damaged OST file and save them into PST format safely.
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Fix a corrupted OST file in Outlook easily with CubexSoft OST to PST Converter. The tool helps to recover inaccessible emails, contacts, calendars, and attachments from damaged OST files and convert them into healthy PST format without data loss. OST to PST Tool supports all Outlook versions with fast and secure recovery.
To fix a corrupted OST file in Outlook by rebuilding a new OST file, you just need to delete the OST file, and Outlook automatically rebuilds a new one because the OST file is a cache copy of the mailbox of the server. If your OST file is severely corrupted or disconnected from the server, in this situation, using a dedicated tool is recommended. You can try DataVare OST to PST Converter. With the use of this utility, you can easily recover and convert your corrupted OST file into PST and access it again in MS Outlook. Using this method is simple and easy, so you don't need to be a tech expert.
Recreating the OST file is usually the first thing worth trying, especially if the mailbox data still exists on the Exchange or Microsoft 365 server.
One thing I’d add is that before deleting the OST, it’s safer to rename it first. That way, if something doesn’t sync back correctly, you still have the original file as a backup.
If Outlook fails to rebuild the OST properly or the file becomes orphaned, you can use Stellar Converter for OST to recover and convert the OST into PST format. It helps extract emails, contacts, calendars, and attachments while maintaining the original folder structure and mailbox data integrity.