It would be trivial for MS to say, "Thank you for buying Microsift WOW! 2006, you are not authorized to copy the program from the CD-ROM to a WINE environment and doing so will constitute a violation of copyright, punishable by a maximum term of five years in prison and a $250,000 fine. Click here to exit the install program"
They can't do that, it would be an illegal violation of anti-trust laws. If they could have done it, you probably couldn't run office on crossover.
Ivan.