OST and PST are file formats used by Microsoft Outlook for storing data. Here's a breakdown of their full forms:
| File Type | Full Form | Description |
|---|---|---|
| OST | Offline Storage Table | Used for storing a synchronized copy of your Exchange server mailbox on your local computer. This allows you to work offline and sync changes later. |
| PST | Personal Storage Table | Used for storing emails, calendar events, contacts, and other Outlook data locally on your computer. Often used with POP3, IMAP, or Exchange accounts for local archiving. |
As referenced, in Microsoft Exchange Server, data like messages and calendar events are initially stored on the server. Outlook, however, stores these items locally in either a personal-storage-table (.pst) or an off-line-storage-table (.ost). These files are stored on your local computer.
Here’s a bit more about how they are typically used:
- OST Files: Primarily used when your Outlook profile is connected to an Exchange server. These files allow you to continue working even without an internet connection and will synchronize with the server once a connection is available.
- PST Files: Typically used for backing up your mail or if your account type does not support offline access. You can also move specific emails or folders into PST files for archiving purposes.
