"Of those 1.37 billion web requests, over 58% came from a Windows system. Even Windows 8.1 alone has more users than OS X does in total, and that's one of the most despised versions of Windows!"
Lets think back to 2000 or so when around 99% of web requests were coming from Windows and think about just how far Windows has fallen in that time. While I agree that Mac OS X isn't really setting the world on fire (and I say that as a Mac user) I do see an awful lot of Macs out there and far more than there were in 2000 so Apple has certainly made up a lot of ground. Also, consider that when you're sitting at a desktop you're likely using the web a lot, but a phone is just occasional use so the fact that 42% of web requests aren't coming from Windows tells you a lot about how much kit is out there that is connecting to the internet. The important change since 2000 is that you could barely manage on the web without IE on Windows. I know, I was a Linux user then and browsing was very painful at times. These days, the web is much better to use because it has to handle all these different browsers on phones and alternative desktops. The thing that kept Windows at the top for all of the 90's was the fact that alternatives couldn't get a shoe in the door. These days, it is very easy to drop Windows. If you want a nice desktop, a Mac is a really good place to go because you get a real desktop OS without all that touch screen, phone UI rubbish shoved into it. You want a phone that works well as a phone and has lots of software? Android and iOS have you covered. Windows has lost the software high ground and the only reason it still has 58% of web requests going to it is simply inertia. MS is desperate to slow the slide but it keeps on going down. I've used Windows 10 and I don't see anything there that will stop this process if they can't get devs to actually put out apps that are unique to Windows and attractive. I don't think they can get back to the heyday of the 90's and having lived and worked through it, I don't think they ever should because we're in a much better place today with real choice. MS should be happy that they still have any customers under the circumstances given just how badly they treated everyone when they were on top.