Does Microsoft Exchange and Outlook use the same PST file? I tried searching in google but could not find an exact answer. Need your idea guys. Thanks
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They are two different things, so the answer is no.
Outlook has a cached version of your mailbox, calendar, contacts, etc, stored in a .OST file. The exchange server uses its own database for storing your mail stores etc.
You CAN also have a PST file open in Outlook at the same time as your Exchange connection, but they are also two seperate files.
When Oulook works with local storage, it uses PST files, which are somewhat like Access databases; they are local files opened and managed by Outlook itself.
When Outlook talks to an Exchange server, it acts like a client application accessing data in a database system; the Exchange store behaves very much like a DBMS, and there is a dedicated server process managing data and serving them to clients. The storage engine is completely different, and so is the file format.
You'll find these links quite helpful: