Here's the licensing summary and the long official licensing FAQ, but I've tried to summarize the important stuff. I find the new licensing much easier to understand then ever before. I issue no guarantees on my ability to correctly read a Microsoft licensing document: Server 2012 only has two editions:
Presentation on Improving Your System Management and Virtualization Skills Below is a summary of a talk I gave to Hampton Roads .NET User Group in January 2012. 1st Part: Tools Developers Should (but don't) Talk About Developers are usually busy being great developers and just what their systems to work.
Taken from the Deployment Guide and the Server Virtualization Guide: If you decide to go virtual, Lync only supports Hyper-V R2 or ESX 4.0 platforms. Windows Server 2008 Hyper-V is NOT supported as "A number of enhancements that are critical for running virtualized Lync Server media workloads were implemented