Running against Exchange Server or using a local information store?
If the latter, all Outlook data is in one file. The file you need to is 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
http://www.howto-outlook.com/Howto/backupandrestore.htm

Signature
Russ Valentine
[MVP-Outlook]
>I am attempting to transfer about 100 outlook contacts from a machine that
> will not allow me to use any of the export utilities. Also, I cannot
[quoted text clipped - 7 lines]
> a new machine. Mom's old machine becomes the 11-year old's homework
> machine.