Yes, the market is fractured at the moment with desktop ruled by Microsoft, Server split between Linux and Microsoft and Mobile devices dominated by Google's Android. With the release of MS Office for Android Microsoft has conceded that the split is likely to be long term.
Operating System choice is becoming irrelevant as more and more software supports Windows, Android, iOS and to a lesser extent OS X. The money has moved to the cloud. Microsoft happily collects the same amount of money from an Android, iOS, or OS X user for Office 365. And they collect it annually, not once like they do with an operating system. In a single move they have negated the number one reason for buying a Windows tablet, because they make far more money from that Office 365 than they would have from from the tablet itself.