The file you need to back up 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

Signature
Russ Valentine
[MVP-Outlook]
> Before formatting my HD the one thing I forgot was Outlook
> contacts. I can extract any file from a backup image I
> took before but does anyone know where the data is stored
> i.e in which folder and the name of the file. If I can
> find this I can copy into my new setup?
> Thanks in advance for any help!