See http://www.slipstick.com/addins/content_control.htm for various methods and tools for controlling disclaimers and other signatures from the Exchange server.
Please think twice, though, about including a graphic automatically in your signature. Some people will be irritated at what they see as a waste of their bandwidth and storage space.

Signature
Sue Mosher, Outlook MVP
Outlook and Exchange solutions at http://www.slipstick.com
Author of
Microsoft Outlook Programming: Jumpstart
for Administrators, Power Users, and Developers
http://www.slipstick.com/books/jumpstart.htm
> For branding purposes, our president wants our company of
> approx. 50 people to use a standard email signature with
[quoted text clipped - 7 lines]
> mention other email programs),is what we're trying to do
> even possible?