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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.
Offline Folder files (.ost). Typically when you use Microsoft Exchange Server, your e-mail messages, calendar, and other items are delivered to and stored on the server. You can configure Outlook to keep a local copy of your items on your computer in an Outlook data file called an Offline Folder file (.ost). This allows you to use Cached Exchange Mode or to work offline when a connection to the Exchange Server computer may not be possible or wanted.