OST is created when users sign in using an Exchange, Office 365 (Microsoft 365), or IMAP email account.īoth OST and PST Outlook data files are vulnerable to damage or corruption caused by inconsistencies as they grow larger and exceed the recommended limit. Outlook creates a PST file when you add a POP3 account in Outlook 2010 or later versions. Offline storage table (OST) and personal storage table (PST) are two different Outlook data files used to store a copy of mailbox items on local storage.
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