Folk periodically ask for OCS/LCS support. There's at least one API out there that claims support:
Of course, there's no way I can develop/test this unless I can get access to an OCS/LCS server. Also I have no idea what the difference between OCS and LCS is, or if there is one.
OCS seems to be a new version of LCS with some new features.
Microsoft Office Communications Server 2007 is an enterprise-grade server that provides the backbone for all real-time communications within Microsoft Office. Presence awareness, IM service, peer-to-peer audio and video, application sharing, and collaboration all depend on it. Microsoft Office Communications Server 2007, the next version of Microsoft Office Live Communications Server 2005, will add on-premise Web conferencing and the ability for Office Communicator 2007 to make and receive voice calls.