The Continuing Fight for Genuine Software (http://www.microsoft.com/presspass/features/2006/apr06/04-24GenuineSoftware.mspx)
QuoteAs part of the Genuine Software Initiative, Microsoft will expand a pilot of the Windows Genuine Advantage (WGA) program that provides notifications to consumers using non-genuine Microsoft Windows XP. Most customers will experience no change, but, for customers who are running a non-genuine copy of Windows, the new feature will enable notifications directly to their desktop that the copy of Windows they are running isn't genuine.
Counterfeiting is a serious problem to software vendors. If you discover that you are a victim of receiving a counterfit version of Microsoft software on your PC, email Microsoft at piracy (at) microsoft.com. In the U.S. victims can also call the Microsoft Anti-Piracy Hotline at (800) RU-LEGIT. (For outside the U.S., check here (http://www.microsoft.com/piracy/Reporting_out.mspx) for contact information.)