How do I fix “OST file not opening” error?
If your OST file isn’t opening in Microsoft Outlook, try these quick steps:
Restart Outlook properly
Close Outlook and end all Outlook-related processes from Task Manager, then reopen it.Recreate the OST file (most effective)
Close Outlook → Go to %localappdata%\Microsoft\Outlook → Delete or rename the OST file → Reopen Outlook. It will automatically create a new one and sync your emails.Use ScanPST tool
Run Scanpst.exe to repair minor corruption issues in the OST file.Check Compatibility Mode
Right-click Outlook → Properties → Compatibility → Make sure it’s unchecked.
Tip: Don’t delete the OST file if it contains unsynced local data.
These steps usually fix most OST issues quickly. For instant recovery, you can try - https://www.blrtools.com/ost-recovery/
anamika
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demetrioparrilla
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To fix the "OST file not opening" error in Outlook, the most effective solution is to recreate the OST file by deleting or renaming the current one, allowing Outlook to generate a fresh, synced copy. To know more the you can read this blog: https://www.softaken.com/guide/outlook-ost-file-cannot-be-opened-in-windows-10/