MED-V is an integral component of the Microsoft Desktop Optimization Pack, a dynamic solution available to Software Assurance customers, which helps reduce software installation costs, enables delivery of applications as services, and helps manage and control enterprise desktop environments.
MED-V 2.0 uses Windows Virtual PC to provide an enterprise solution for desktop virtualization. By using MED-V, you can easily create, deliver, and manage corporate Windows Virtual PC images on any Windows-based desktop running Windows 7 Professional, Enterprise, or Windows 7 Ultimate.
Refer to Microsoft Enterprise Desktop Virtualization home page and more documentation here.