Network World has published an extensive piece titled Microsoft Warms Up Voice Software Plans. It’s worth a read because it ties together all of the pieces of the Microsoft strategy, including the Teleo acquisition, MSN, the RTC, Live Communications Server, Office Communicator and traditional Microsoft assets like Active Directory.
The article also asserts that Microsoft’s focus will be on the interface, and not the backend. I don’t believe this. Microsoft has too many server-side assets to not try to integrate them with the VoIP infrastructure.