Hey there :) You shouldn't have to call them. Generally, you have to change three major components SIMULTANEOUSLY before it's even an issue ... so changing your video card ever few months won't ever cause you grief. Let's say that you trip "the trigger", then your machine has an unspecified number of re-authorizations from Microsoft (online BTW - you don't have to call if you don't want to). This is at least 3, but might be as many as 12. So, if you make major simultaneous changes more than say, 6 times , you might have to call Microsoft - but during the beta period the hold time was less than 3 minutes :) Ken