Total computer installs M$ is destroyed by Linux. That is installs on TVs, Tablets, Phones, Servers and whole range of appliances. M$ is now just hanging in there on the desktop based upon nothing but lock in via applications and existing data and that is real bad, in new markets in only has the Xbone and the Xbone will come under real threat from more and more powerful smart TVs and smart phones. Keep in mind, with smart phones, with portable custom fitted VR glasses (still to hit the market), you have a big screen in your pocket and that is doom for game consoles.
Business, there are real problems there, no business wants to be spied on and it business practice advantage put up for sale to the highest bidding competitor and that does not even touch medical practices, where M$'s spying is against the law and both the medical practice and M$ come under real legal threat.
M$ is now wildly uncool and that is doom in the consumer market. M$ does not maintain the privacy of business and that is a real problem. The desktop market will shrink to power users and they are a really fussy, demanding market and as far as M$ gross invasion of privacy and demands for control over power users, they have a great big ole 'fuck you' coming.
There were much smarter directions to go in, they were just stupidly arrogant and it is unlikely they will be able to come back from that. Never forget desktop PCs and the consumer market are parting ways, so M$ will lose the bulk of the PC market right there, not to competitors but to smart phones, smart TVs, tablets and cheap simple notebooks running Android (way good enough for what most of them will be doing). So not so much M$ losing the desktop market, just the desktop market pretty much shrinking back to early 2000 levels and M$ is pissing that market right off, so screwed and they deserve it.