To recover a missing Outlook OST file:
Check the default location.
Use Windows search.
Check your backup.
Look for archived OST files.
Recreate the OST file if possible.
Recover from a backup or PST file.
Consider professional recovery software if necessary.
If none of the above methods work and the missing data is critical, you may consider using professional recovery software, like Kernel for OST to PST Converter, to recover the missing OST file data.
https://www.nucleustechnologies.com/ost-to-pst-
converter.html
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