There is a crazy thing that analyst Horace Dediu of Asymco said that is probably not true, but raises some important points anyway:

If Windows remains marginal on tablets, the "PC market" will likely tip away from Microsoft in two years (depending on how quickly Apple can build iPads.)

84% of all "PCs" currently being shipped are Windows PCs. This is being generous to Apple and saying tablets are PCs too, which Microsoft itself insists is the case. So how could that still-overwhelming lead possibly be overcome quickly enough that within two years, Windows is shipping on less than half the systems -- PC or tablet -- in the world?

Good riddance.  To read the rest of the article, click here.