Open source has grown to the point of becoming a threat to Microsoft (how many of us have been waiting and hoping this would happen?). Microsoft is not going to open their greedy arms and welcome us all in. They are only about money and their past shows how they treat competition.
They know they can't compete with the best programmers in the world (not on their payroll) who are committed to open source.
Combine open source and the money-mad machine and you'll see a whole lot of slimy activities to steal, cry infringement rights (in our "new world" they'll sue successfully once they can zero in on a target who is now committed to a deal).
I don't know all they have up their sleeves, but their past hasn't just disappeared or magically changed so quickly.
I saw them rise and know their story and I simply don't trust them.
Of course, that's my opinion and I'm glad we can still all have one.