Microsoft has been trying very hard to control piracy, even by going to the extent of offering Microsoft Office for only $29 in China, but no matter how hard they try they have not been able to control piracy at all.
The proof of it is the availability of a crack for Windows 7 RTM which allows users to successfully activate Windows 7 using a licensing exploit.
The crack also passes the so called anti-piracy Windows Genuine Advantage (WGA) that Microsoft has in place to prevent pirated copies of Windows from downloading updates to their computer along with free software offerings for genuine Windows customers.
The leak for the Windows 7 RTM crack has been confirmed to come from Lenovo OEM key which was leaked out.
While Microsoft has been focusing on making a great OS, they are still quite a long way from protecting it from piracy.