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OST file (.ost) An OST file (.ost) is an offline folder file in Microsoft Outlook. Offline folders make it possible for the user to work offline and then to synchronize changes with the Exchange server the next time they connect. The ability to work offline is useful in environments with limited or unreliable connectivity.
Then you run scanpst.exe against your .ost file. Scanpst.exe is located in \Program Files\Microsoft Office\Office14 (or \Program Files (x86)\Microsoft Office\Office14 for 32-bit Outlook installed on 64-bit Windows). If ScanPST reveals errors, you should let the utility attempt to repair them.