Does it really matter much? Microsoft is losing market share every month. Chromebooks are popping up like crazy and are best sellers on Amazon. We're seeing SteamOS now making its appearance. Android for PCs is gaining more traction. Tablets are eating into PC sales more and more.
Microsoft doesn't matter. They made sure of that with Windows 8 by telling people what they wanted, and then with 8.1 by acting like people are so stupid they can't tell the difference between a start button, and the start button that opened the menu they want.
Result? Month after month Windows market share loses a tenth or two of market share, inexorably declining. It will keep accelerating, as once a competing platform reaches critical mass, it gets more support and software, gets better hardware and software, gets more mass, gets more support and software, etc...
There's no way for Microsoft to compete. You can't sell an OS for $100 when the competition is free. $100 is too much hardware, whether you want a faster processor, better mass storage, a nice screen, etc..., especially with the popularity of lower cost machines.
Microsoft has become irrelevant, and Windows is a dying platform. Better to review new Chromebooks, or Android based machines, as the free OS is the future, Microsoft is the past.