I was raised on a Microsoft desktop. Well, on a Microsoft command line to start off with. I've been going back and forth between various flavors of Linux and Windows for years. First one I tried was Mandrake. I simply go back to Windows because it lets me play the latest games. I've been keeping up with Ubuntu releases and I even had a paid account for Transgaming. Transgaming experiences weren't the best. Poor fps, even on pretty good hardware at the time.
But certain things that you just take for granted in a Windows world take a lot of effort in Linux. Getting my wireless card in the laptop to work, installing Nvidia drivers, getting my work (windows mobile) device to sync, plus using software that I need for work which have no Linux versions available are just examples of things that pull me back to Windows.
Year of the Linux desktop will be different for everyone. Once I'm able to seamlessly switch without requiring too much effort, it'll be the year of the linux desktop for me. It may be 2009, it may be 2015, who knows. Till then, Windows is filling a gap that Linux cannot.