That "region" is a very big market. So that is not really an option for them. On the other hand large parts of the economy and government in the EU are totally dependant on Microsoft products and would be screwed if they would pull the plug.
IMO, abandoning the EU would be fatal to MS, not exactly because of lost revenue but because of second order effects. But I didn't want to put my opinion on the GP post.
They wouldn't abandon the market, they'd just introduce a complying version for Europe like N or K versions in the past. That way they can continue to screw everyone else.
