Third place was the target
Installed base at end of Q1 2013:
1 Android _______ 823M _ 57%
2 iOS __________ 277M _ 19%
3 Symbian ______ 165M _ 11%
4 Blackberry _____ 97M __ 8%
5 Windows Phone _ 28M __ 2%
6 bada __________ 27M __ 2 %
Oops - they missed. Windows is not the 'third ecosystem'. It is 5th. Elop set fire to the Symbian platform so Windows Phone might gain one position. Blackberry could mess up their come-back and drop out of the running. Windows might get into fourth place for a short time, but then will be overtaken by Tizen and at least one out of Sailfish, Ubuntu and Firefox.
Have you got any evidence for 'Nokia's resurgence'? I know they sold the most expensive smart phone in the world - their head office. They cannot bump their smart phone revenue the same way again.
I agree that focussing on the business market is a one way trip to legacy land. The thing is, they do not have many choices. Microsoft depend on manufacturers installing Windows on everything, but they are burning their relationships with manufacturers. Patent extortion, copying manufacturers unique selling points into surface and crowing about 100M licenses shipped (to manufacturers who cannot sell them on) are not the best ways to keep essential business partners happy. In a year or two, Windows on a new computer will be an expensive add-on feature - not bundled whether you want it or not.
I have known for years that Microsoft Linux was inevitable. I did not expect to see it so soon:
The next big milestone to look out for is Microsoft Office for Android.
You may not see anything wrong with Surface, but millions of other people do. We know this because they bought ABM.