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OST file

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- 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.

Another type of file in Outlook is the PST file, which is simply stored on the client or a server other than the Exchange server.

LAST UPDATED:

24 Oct 2006

Read more about OST file:

-	SearchExchange.com offers more information in their Learning Center: All about .OST files. (Free registration may be required.)
-	XP Professional explains working with offline folders.
-	Expert Zone Columnist Sharon Crawford explains how to use the Offline Files feature to work with shared documents and encrypt them to secure data.

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RELATED GLOSSARY TERMS

Terms from Whatis.com − the technology online dictionary

offline folder file (SearchExchange.com)
An offline folder file is the location for offline folders (OST files) in Microsoft Outlook.

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