Volume Licensing customers have some flexibility in how they can deploy Windows 7 in their organizations.
As a benefit of Software Assurance coverage for Windows desktops, customers may leverage virtualization use rights.
This use right allows running the software in up to four local virtual machines.
While a customer’s right to use Windows 7 Enterprise may survive the expiration of their Software Assurance coverage, the Virtualization Use Right does not.
For further use right details, please refer to the Product Use Rights document.

