You can do this with a custom form. See
http://www.outlookcode.com/d/forms/reqcat.htm

Signature
Sue Mosher, Outlook MVP
Author of
Microsoft Outlook Programming - Jumpstart for
Administrators, Power Users, and Developers
http://www.outlookcode.com/jumpstart.aspx
> We would like to create one Master Category List in Outlook 2003 for all
> of
> our users in our public contacts. We use Exchange 2003 and I don't see
> any
> way to do this. Any help?
> Greg