Microsoft produced readily available for download on March 26 a public beta version of Office Communications Server (OCS) 2007,
Cheap Office 2007, as business officials indicated they planned to perform previously this month.
OCS 2007 is Microsoft's combined instant-messaging/VOIP/audio-video conferencing server,
Office 2010 Pro, and the successor to Microsoft's Live Communications Server product. The final,
Microsoft Office 2010 Pro, shipping product is slated to be offered this summer,
Office Pro 2010, according to the Softies.
My ZDNet colleague David Berlind has lots more details and video footage of OCS 2007 and the accompanying Workplace Communicator client software.