Since OST is encrypted by default with MAPIEntryID GUID key, an orphaned OST cannot be opened or accessed in the same or any other Outlook profile. OST file becomes orphaned when the email profile is deleted from the online mailbox server. This can lead to inconsistencies in the OST file, resulting in Outlook performance issues and errors.įurther, events such as system crashes, abrupt shutdown, force close Outlook, virus or malware intrusion, faulty add-ins, etc., can also cause damage to the OST file.
As you send or receive emails, the file may get large or exceeds the maximum recommended limit (~20-25 GB).
Offline Storage Table (OST), also referred to as Offline Folder, is an Outlook data file that stores a synchronized copy of all your mail items from live Exchange Server, Office 365, IMAP, or on the local machine.
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