After reading this (http://blogs.msdn.com/b/jw_on_tech/archive/2012/05/25/google...) I think his preference is mostly cultural. I never worked at Google, but I was born, raised and work in tech in the Bay Area. Microsoft culture rubbed me the wrong way when I was there. It seemed more what I imagine to be an organized and orderly Northern European governance under the cloudy, rainy skies. California Bay Area culture is more sunny and free libertarian with a dash of anarchy thrown in. You may discount my general characterization, but these things matter and people definitely have a preference.
Anyone who licenses software from Microsoft knows that lately their most important objective is increasing licensing revenues.
Changing products to increase licensing or changing them to enhance a different revenue stream is six of one, half a dozen of the other for me.