![]() Generally, the IMAP accounts, exchange accounts, Office 365 accounts use this offline outlook data file (.ost) to store a cache of the data from your Microsoft outlook. Once the internet connection is re-established, or restoration of access to mail server happens, the messages and the data items get automatically synced. ![]() So, when your internet connection gets disrupted, you can still access the local copy of emails and data in your outlook and work on them. A clone or replica of all your mail messages and data in the exchange server mailbox is saved on your local computer automatically, as an OST file. The offline folder allows users to work on their messages and mail the data offline, even when access or connection to the mail server is not there. OST is an offline file folder present in Microsoft Outlook.
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