I'm not quite sure how I feel about this. The first two things that come to mind are "generic" and "Windows."
While it's good that it maintains brand recognition while being a completely new logo, anyone could make that exact logo in MS Paint in 2 minutes (yet, knowing megacorporations like Microsoft, millions of dollars probably went into this rebrand. And while the simplified Windows logo is recognisable, Microsoft has a much larger range of products than just Windows, now.
Even though I think of the whole branding as a bit bland, I can see this sticking around for at least a little while due to its simplicity.