Microsoft never sued anyone for purchasing their OS and installing it on 'unapproved' hardware

Yes, Microsoft is looking at what Apple is doing with envy and trying to copy their amount of control, but Microsoft is also being watched by government anti-trust regulators (both in the US and EU) so they are going to be more limited in what they can get away with doing.

This doesn't mean that you don't have to watch out for Microsoft, but they are going to be able to get away with a lot more if they can point at Apple and say "we're just doing what our competition is doing, users are showing that they want us to do this by buying their products"