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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.
On the Home tab, in the New group, click New Items, point to More Items, and then click Outlook Data File. In the Create or Open Outlook Data File dialog box, in the File name box, type the name as you want it to appear in the Outlook Navigation Pane, and then click OK.By default, data files are not password-protected.n offline Outlook Data File (.ost) is used only when you have an Exchange account and chose to work offline or you use Cached Exchange Mode. It isnât necessary to back up an offline Outlook Data File (.ost). A new .ost file can be created from the data saved on the computer is running Exchange Server.