If it doesn't have "8" or "Phone" after it, nobody thinks or cares about Windows anymore. But let's not forget that Microsoft is still selling a gargantuan tower of operating systems every second—and it matches everything else combined.
Dan Frommer put Microsoft's recently reported 525 million Windows 7 licenses in perspective:
Since...October, 2009, Apple has likely sold about 35 million Macs, possibly 250 million iOS devices, and Google has seen almost 250 million Android activations.
We may have our eyes on mobile software and operating systems that don't yet exist, but an enormous chunk of the human race still looks at (and buys!) regular old Windows every single day. Every, single, day. [SplatF]