If you require to make changes to Outlook or any other application with Microsoft Office for multiple users via group policy you will need to download the ADM template.
You can download Office 2003 ADM’s from: http://office.microsoft.com/en-us/ork2003/HA011513601033.aspx or http://www.microsoft.com/downloads/details.aspx?FamilyId=BA8BC720-EDC2-479B-B115-5ABB70B3F490&displaylang=en
You can download Office 2007 ADM’s from: http://technet.microsoft.com/en-us/library/cc178992.aspx
Instructions on how to install the ADM’s can be found at: http://support.microsoft.com/kb/826170