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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.
When MS Outlook is run for the first time on a computer, it creates the important data files automatically. OST files are created as soon as you start working on MS Outlook. Outlook data files are saved at C:\Documents and Settings\Local Settings\Application Data\Microsoft\Outlook. If you wish to create an OST file yourself, then follow the instructions below: Click on the File Menu and select Work Offline option.