I've never had a problem with it, personally. I am curious though if MS keeps statistics on the calls/connections they get for product activation. The reason I say that is this: just because a system _shipped_ with XP, doesn't mean it _runs_ XP. I found it interesting that at the local university all the new Dell computers in the computer lab that have XP Product ID stickers on them are actually running 2000 Pro!

My guess is that for compatibility or other reasons, there are lots of people who prefer something else. This of course skews statistics about XP use, because they are removing XP and installing a different operating system.