Forums will be making significant UX changes to address key usability improvements surrounding search, discoverability and navigation.
To learn more about these changes please visit the announcement which can be found
Some more details will be needed to offer you any assistance. Are both users internal, or externally connected? What is your OCS deployment scenario? 2007 or R2? Are you testing a video conversation in Office Communicator or using the Live Meeting client?Jeff Schertz, PointBridge | MVP | MCITP: Enterprise Messaging | MCTS: OCS