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 again.
But what if you need data from the old OST? An ost to pst converter can help you export ost to pst and recover mailbox items. OST to PST Converter Software provides an OST to PST Conversion tool to help users convert OST to PST emails and access important mailbox data.
Choose PDS OST to PST Converter Software when you need a practical solution for recovering data from an old OST file.
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https://blog.perfectdatasolutions.com/how-do-i-convert-outlook-365-ost-to-pst/