You are only looking at a tiny fraction of the industrialized economt. Another example that proves the opposite is - well Nokia. We have Samsung, we have Sony and Ericsson (in all their different variants), Siemens, LG, and Apple, just to mention a few, and of course BMW, VW, Boeing etc etc.
Besides, MS has done great success with Windows CE in billions of devices, and WP is only the last and most advanced version of that OS.