If your Outlook OST file is corrupted, inaccessible, or experiencing synchronization issues, rebuilding it can help restore normal mailbox functionality. You can rebuild the OST file by closing Outlook, locating the existing OST file, renaming or deleting it, and restarting Outlook to let it create a fresh file.
However, if you need to recover or save your mailbox data before rebuilding, using an ost to pst converter is a practical option. PDS OST to PST Converter Software helps users export OST to PST and convert OST to PST emails while maintaining mailbox data.
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https://blog.perfectdatasolutions.com/how-do-i-convert-outlook-365-ost-to-pst/
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