Pull out of mobile? Meanwhile the entire world is pushing mobile market making a lot bigger than the desktop pc market? Not a really good idea. It would be a suicide and they know it, that's why they are putting billions of money in windows phone and nokia, they NEED at least a minimum marketshare (10%) in the mobile market
There are also lot of people making a lot of money in the energy industry. Is it time for Microsoft to start drilling for oil, too?
"Mobile" has little overlap with the markets that MS has built 30 years of competitive advantage in. Phones and tablets are not general substitutes for PCS.
Microsoft's venture into the "mobile" market has resulted in them slapping the Windows name on products that are almost - but not quite - entirely unlike Windows, and this has brought a good deal of frustration to many people.