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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.
The basic difference between Outlook data file formats (OST and PST files). Traditionally, Outlook supports and works with two types of storage files â OST and PST. The more common PST files are used for storing data related to POP3 and IMAP accounts.Apart from emails and attachments, PST files contain all other items that Outlook works with: contacts, tasks and notes.nlike PST files, OST files are used for offline storage of Outlook data. They are used only if you have an Exchange account or use the Cached Exchange mode. There is no need to back up these files, since they can always be recreated from the data stored in your Exchange account.