With Windows Anytime Upgrade (WAU), Microsoft has built a simple and convenient way for customers to upgrade from Windows 7 Home Premium to Windows 7 Professional, when they discover they want or need more out of their current operating system. Users can go online "anytime" to upgrade from: Windows 7 Home Premium only to Windows 7 Professional.

With the introduction of the WAU model for upgrades, customers can now upgrade to a higher edition of Windows 7 without losing any data or functionality. With the good, better, best concept of Windows 7, upgrading simply means adding more functionality to what was available in the lower edition.