Microsoft was never the place new ideas and true innovation came from. But they did once have the power to shut down people who had them. They no longer do; that's what's changed.
From GUI perspective MS did a lot of things that X and MacOS "adopted" or tried to adopt silently, so to say.
After all, MS does hire talented staff. Just don't underestimate them.
What is the difference between "true innovation" and -- I don't even know how to ask this exactly -- "untrue innovation"?