It's worth noting that there's nothing legally wrong with a monopoly per se. It's the abuse of a monopoly that brings up antitrust issues. Not that that will keep MS out of hot water. But they can at least point to Sony's ineptitude and state that they had nothing to do with the collapse.

Well, when you take game consoles into account, and the fact that X-Box has been a loss-leader for MS, I conclude that MS would have more benefit than damage with Sony taking it on the chin, so to speak. Sony's Windows machines are just a fraction of the total Windows boxes out there. So MS may lose some market share in some aspect (which could be made up by other Windows vendors) but stand to gain a lot in the gaming arena.