Microsoft won't win with WP7 until they make it in their partners interests for it to win. Google did that by giving them a say in how the operating system looked and worked and a cut of revenue from apps.

Microsoft made a nice OS but there is just no reason for either the carriers or the manufacturers to want this OS to win. Right now it is a nice option to have around to keep Google honest and that's about as far as MS partners will go to promote it. Beyond that, WP7's success is a net loss for everyone except MS with no compensating upside. Microsoft has to figure out an equation that wins for everyone like Google did, and then we'll see things happen.