From: Mike N. 


http://www.pcworld.com/article/id,129148-c,vistalonghorn/article.html#

"Windows Vista can be used for as long as 120 days without agreeing to
its product activation antipiracy software, the company confirmed Friday.
That's four times longer than the 30 days the company has widely used as
the maximum time span the operating system can be used before it shuts
down.
....
The one-line command of "slmgr -rearm" changes the activation
deadline to 30 after the current date, Livingston said. ....
Extending the grace period, the spokeswoman continued, is not a violation
of the Vista End User License Agreement (EULA). .....
"

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