Some of the features can be disabled at the global level, like Live Meeting conferencing, Desktop Sharing, or Dial-In Conferencing. To limit other built-in features like Communicator calling, Video Conferencing, or even IM then you can use Group Policy settings to disable those features on the client themselves.
Assuming you've deployed 2007 R2, here is the Communicator.adm Group Policy template and documentation:
http://www.microsoft.com/downloads/details.aspx?FamilyID=5d6f4b90-6980-430b-9f97-ffadbc07b7a9&displaylang=enIf not using R2, then here's the documentation for the previous version's settings:
http://www.microsoft.com/downloads/details.aspx?FamilyId=69512283-7ED6-40A6-82A8-B215DA051D9A&displaylang=en
Jeff Schertz, PointBridge | MVP | MCITP: Enterprise Messaging | MCTS: OCS
