Comment Easy, arbitrary multi-monitor support (Score 1) 1215
At work I use seven monitors of various sizes and orientations, and at home I use four. Software needs notwithstanding, Windows' effortless support of these configurations is really the deal-maker for me. I use a lot of Linux servers, and my daily carry is a retina MBP, so once or twice a year I get a hankering to install Linux as my primary desktop OS, only to invariably run into issues with monitor configurations.
Linux was my primary client OS from 2000 to 2004 as I used only a single machine, a laptop, for everything, but these days it doesn't meet my (client) needs.