Microsoft Office Communicator 2007 requires OCS 2007

Microsoft released Office Communications Server 2007 (OCS 2007), its much-awaited next-generation telephony/Unified Communications product, with much fanfare in San Francisco earlier last week. This is a major update to its predecessor - Live Communications Server 2005 (LCS 2005).

The new client, Microsoft Office Communictor 2007, requires OCS 2007 at the server end. It does not work with LCS 2005, even with reduced functionality. More product requirements can be found here for the new Communicator client.