Extending the Vista Activation Grace Period to 120 Days
 

A bug exploit?

"Unlike other methods that freeze the activation countdown timer, extending the trial to 120 days requires no hacking, cracking or illegal third party files. All one needs to do is log into Windows Vista with administrator rights, launch the command prompt and type in: slmgr –rearm

http://www.dailytech.com/article.aspx?newsid=5952