The last time I heard about Microsoft working together with a company to produce a duel boot system, was when OS2 was going to be the B all of future development. However Microsoft and IBM fell out, which caused major repercussions in the industry. I can still remember the company I worked for at that time, investing huge in OS2, and I was already teaching companies OS2. It went pairshaped of course and was the downfall of Lotus 123.

Microsoft will work with Apple until it suits them and pull the plug and go their own route.