You need to configure the Outlook Address Book Service. Method depends on
your Outlook version, which you should post when you post questions. This
article covers some:
http://support.microsoft.com/default.aspx?scid=kb;en-us;287563&Product=ol2002

Signature
Russ Valentine
[MVP-Outlook]
> recently I had to reload windows xp and office and now I can't open the
> address book in Outlook but I can open Contacts. Hopw can I get my
> address
> book tab to work again?