Friday, April 10, 2026

Outlook has two different types of data files

The Hook: Ever wondered why your Outlook has two different types of data files?



The Meat: * OST (Offline Storage Table): Think of this as a mirror. It reflects what's on the server so you can work offline. If you delete the account, the mirror "shatters" (file is deleted), but the server data stays.

PST (Personal Storage Table): Think of this as a suitcase. You pack your emails into it to move them or keep them safe on your local drive. It’s perfect for archiving and backups.


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