The concept of one OS for all platforms is also spreaded by canoncial with their new concept of Ubuntu. But I cannot see that many advantages of it, as their is the trend of "consumers" to buy smartphones and tablets rather than computer which is fine, as a computer and espacilly Windows is designed for business applications, working, doing stuff. iOS and Android were designed to be used by consumers, surfing, chatting, social media, taking a quick photo, always have it at hand. So why should someone try to make a common look and feel for two very different systems? How am I supposed a UI which is optimized for touch operation with my keyboard? If I were MS, I would offfer two Windows versions: Windows Consumer and Windows Business, one with the fancy looking tiles and stuff for the phones, tablets and those who want it on their computers and one robust edgy Windows for those, who want to be productive, to build, design and work!