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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.
Trying to start Outlook 2013 but keep getting the message Cannot start Microsoft Outlook. Cannot open the Outlook window. The set of folders cannot be opened. The file C:\Users\AppData\Local\Microsoft\Outlook\MyName.ost is not an Outlook data file (.ost). Any help would be appreciated. 77 people had this question.