Did you check the permissions on your Contacts folder?

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Sue Mosher, Outlook MVP
Author of Configuring Microsoft Outlook 2003
http://www.turtleflock.com/olconfig/index.htm
and Microsoft Outlook Programming - Jumpstart for
Administrators, Power Users, and Developers
http://www.outlookcode.com/jumpstart.aspx
>I can easily share my contacts with others, but Outlook 2007 seems to have
> taken away my admin's ability to ADD a contact to my Outlook Contacts. Any
> suggestions?