It changes for whichever browser your using, not that funny IMO
And if im honest how do you know that Mac isn't running XP? :/

I don't quite understand your question but if you're on about installing legitimate updates for a 'virtual' XP then Microsoft will see from their browser that they're actually using a Mac and won't give them updates as they can't tell if they've got XP as well. In the virtual XP though if they went on the MS website using IE then it would be fooled as it would think it was actual XP (and it might well be) and you'd then get the genuine update.
Why oh why would they use a macintosh. You raise a fair point but why not just get yourself a normal laptop with xp on it and take that? That almost looks like deliberate product plaement ;P
I've seen that picture before, imo i think someone just has a few photoshop skills.
It's shows images corresponding to the browser you are using.
That went fast.
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