To rebuild an OST file, close Outlook, locate the existing OST file, rename or remove it, and then restart Outlook. Outlook will automatically create a new OST file and synchronize your mailbox data.
If you need to recover data from the old OST file, PDS OST to PST Converter Software can help. This ost to pst converter lets you export OST to PST and convert OST to PST emails into an accessible PST file.
The OST to PST Conversion tool is useful when you need to extract emails and other mailbox items from an old or inaccessible OST file.
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https://blog.perfectdatasolutions.com/how-do-i-convert-outlook-365-ost-to-pst/
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