Microsoft Vista's Activation Cracked
Activation as a means to fight piracy is apparently a bad idea. Look what had happened to Microsoft shortly after Vista came out:
BetaNews in Hackers Find New Vista Activation Crack:
[...] it was only a matter of time before hackers figured out how to reproduce a local KMS using a VMware image and a VBS script. From there, as long as the edition of Vista is either Business or Enterprise, the keys generated would successfully activate the operating system