All Outlook data is stored in the same file, your Personal Folders file
(*.pst) It's where all the mail, calendar, contacts etc. are stored.
Take a look at these pages for info on Outlook data backup:
http://www.slipstick.com/config/backup.htm

Signature
Russ Valentine
[MVP-Outlook]
> Where is the Contacts stored on my PC? I'm using Outlook XP on Windows XP
> Pro. I know where the PAB is, but can't find the Contacts there. :-(
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>
> "Daddy, what does FORMATTING DRIVE C mean ?"