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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.
Click the File tab. Click Account Settings, and then click Account Settings. Click the Data Files tab. The Outlook Data File (.ost) location appears in the Location column for the Exchange account. You can change where the offline Outlook Data File (.ost) file is saved, such as a different folder or hard disk.