hi,
There is a microsoft support document about UC Client supports on Terminal Services environments:
http://forums.microsoft.com/unifiedcommunications/ShowPost.aspx?PostID=1734266&SiteID=57
<quote>
Communicator 2005 and Communicator 2007 support Terminal Services and Citrix MetaFrame only when Communicator is used for text chats and presence functions.
Live Meeting 2007 is not optimized for use with Terminal Services. Features and functionality are not supported when Live Meeting 2007 is used in a remote desktop environment.
</quote>
Sincerely,
Tonino Bruno