Apple has an advantage here in that the difference between iOS and OS X is smaller than that between Windows and Windows Mobile, or Android and Chrome OS. Apple

Apple has an advantage here in that the difference between iOS and OS X is smaller than that between Windows and Windows Mobile, or Android and Chrome OS. Apple is also moving ahead now that they are adding mobile features learned from iPad back to desktop in OS X 10.7. By comparison Microsoft is still in the process of trying to figure out how mobile features look like, while Google has the problem of fragmentation of Android and not-released-yet Chrome OS. I doubt either is far into thinking about merging mobile and desktop as of now.