scavern is correct about M$ and its threat to check all Corporate keys against a database (all key in fact). But this has nothing to do with the Corporate conversion CD itself. It is just the key.
Although SP1 does not accept the most common pirated keys, it does not in itself have a built-in serial blacklister (a blacklist database with common blacklist keys, yes). SP1 is supposed to be more cooperative with Windows Product Activation version 5...which is due to be active by mid Oct.
WPA ver5 supposedly will check your key when you go to M$ Windows Update and if it is discovered that you have an illegal key, M$ disables your activation status and gives you a 3 day grace period to do something about it.
Supposedly if you have not installed SP1 it is far more difficult for M$ to disable your status. This nasty M$ feature is imbedded in SP1.
However, this is all speculative based on info from M$ and others. Once M$ implements WPA ver5...we will be able to confirm if this is true or a scare tactic from M$.
But then again if you don't go to M$ Windows Update...how are they going to catch you?!