Those are just two steps Microsoft has made to entice more customers to buy into Software Assurance, which hasn't been embraced as widely as Microsoft had hoped. In March, Microsoft rolled out 18 new benefits for Software Assurance customers, and on Wednesday the Redmond, Wash., company said it will make Windows Fundamentals for Legacy PCs available at no cost to Software Assurance customers. That version is designed to allow customers to run Windows XP Service Pack 2 on legacy PCs. Microsoft said that will ease the customer transition to Vista Enterprise.Industry observers said the move encourages customers running older versions of Windows to migrate directly to Vista Enterprise, since both are available directly through Software Assurance. Vista Enterprise, one of several different versions of Vista for consumers and businesses, will support older Windows workloads in light of Wednesday's virtualization licensing announcement.