In December Microsoft revealed that with the arrival of Windows Vista Service Pack 1 some changes were going to be made in WGA. One of the known changes will be the "abandonment" of reduced functionality mode.

Today, Alex Kochis, one of the leaders in the development of WGA, revealed that the new WGA present in SP1 was developed to detect two types of cracks that deceive the operating system activation system. With the launch of Microsoft's first Windows Vista operating system upgrade package, Microsoft wants to exterminate all cracks for its current operating system.

Source: ClickTI