To rebuild an OST file, close Outlook, locate the existing OST file, rename or remove it, and then restart Outlook. Outlook will create a new OST file and synchronize your mailbox data.
If the old OST contains important data that isn’t available on the server, use OST to PST Converter Software to export OST to PST before rebuilding. A reliable ost to pst converter or OST to PST Conversion tool can help you convert OST to PST emails and recover accessible mailbox items safely.
PDS OST to PST Converter Software provides a practical solution when you need to recover data 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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