Microsoft is onto something. With Windows 8 it's better positioned than both Apple and Google to ride the coming laptop-tablet convergence wave.It might even eventually give Microsoft a shot at the all-important smartphone market. To understand why, let's count the ways in which Windows 8 is best.1. Tablet-laptop convergence Laptops and tablets are converging. And only Microsoft has an OS that's fit for that coming unification of devices.Apple has no convergence strategy at this time. That's because it fiercely guards product-specific profit streams and just doesn't go in for making things that cannibalise its own sales.So, Mac Mini is hobbled...