http://blogs.technet.com/kpalmvig/archive/2009/03/10/ocs-2007-r2-downloads.aspxThe OCS 2007 R2 binaries were recently released for public download. The table below is a compiled list of currently available R2 downloads: Title Microsoft Office Communications Server 2007 R2 Trial Download Microsoft Office Communicator 2007 R2 Trialen-USCommunityServer 2.1 SP1 (Build: 61025.2)