"MS says they have 75% market share for x86 servers (I've no idea if that is a legit statistic). Macs are barely a blip in desktop/laptop market share. Win 8 and Win 8.1, which according to comments in posts like this is the worst OS since Win ME, each has greater market share than all versions of Mac OS combined."
I can believe that MS has 75% market share for x86 servers simply because you can replace a whole host of Windows servers with a single Linux box - I know, I've done it multiple times. When it takes several machines to do what a single *nix box can do then sure, you're going to get high market share but that doesn't necessarily mean you're doing a good job. This is similar to their claims for IIS when it is just hosting parked domains.
MS has a bigger problem than that though because they're failing to break out of the jail of desktop in any serious way. Xbox cost a fortune and while the 360 did OK, the One is struggling badly compared with the PS4. The Windows phones are a joke, as are their tablets. The desktop may not be going anywhere soon but people have so widely embraced other technologies like Android and iOS that the desktop has little leverage any more. They simply can't use it to control the world and stop people leaving. Windows 8 was their attempt and it is an abject failure. 9 may be a decent version of Windows but really they've got no growth left in them. MS needs to get away from the idea of owning the platform and focus on developing software because they don't have the leverage to succeed the way they did back in the 90's and 00's. The sad fact is, the software they make which isn't supported by their OS isn't really all that good. Can they write good software without the tie in to the OS? I don't know but the signs aren't good.
The funny thing is I remember reading back in '97 that the whole world would ditch UNIX and switch to NT over the following few years. Without Linux, maybe that would have happened but now the spawn of Linus has really spoiled their day, especially Android despite their bogus patent claims. I agree with the other poster, if they had been broken up back in 2000 I suspect the world would have seen a lot more innovation and maybe Apple wouldn't have had the chance to grab the lion's share of the profit and overtake MS in the value stakes.