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Offline Outlook Data File (OST) facilitates offline working in MS Outlook. Your works will be saved in OST when Outlook is not connected to Exchange. Later, when Exchange connection is established, OST files are synchronized with the Exchange mailbox to make them identical. This is how OST files work. Usually, it is not recommended to backup OST files as they can be re-created from Exchange anytime. But the things are different when the...