Short bio: Computer Scientist, FOSS supporter (read more)
Tux Machines (TM)-specific
If you consider NetApplications' data set, then Linux owns only about 1 percent of the desktop OS market and Windows has almost 92 percent. But if you consider all computing platforms, including mobile, than Windows has only 20 percent and Linux has 42 percent - and that would be in the form of Google's Android alone.
Goldman Sachs recently published a chart which shows the shift from Microsoft's 95 percents hare of the computing platform market in 2004, when PCs dominated the computing landscape, to just 20 percent in 2012.