Unlike PST Outlook data file, you cannot import or open OST in any other Outlook account as it is encrypted with MAPI EntryID GUID.įurther, an OST file may also become inaccessible due to synchronization errors between Exchange server and OST file. Thus, allows you to access emails and lets you complete pending work even when the system is offline or not connected to internet.īut when a user mailbox is deleted from the server or account is removed, the OST file enters into an orphaned state and becomes inaccessible. This Offline Outlook data file (OST) stores a local copy of the mailbox items stored on the server. When you setup an Exchange, IMAP, or account in MS Outlook on Windows, it creates an Offline Outlook data file.
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