Offline folders files can be used to keep messages locally on a machine; these messages do not count towards your total mailbox space in your exchange mailbox. This therefore enables users to manage their mailbox space more efficiently.
Please note: Responsibility for the messages after they have been removed from hosted mailboxes is with the client.
To create a new offline folder file you will need to:
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Click File > Account Settings > Account Settings.
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Click on the Data Files > Add.
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Specify a location for the Offline Folder File and go to OK.
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Click on Close.
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Your PST file has now been created and can be found on the left hand side in Outlook under mail folders.