@I ain't Spartacus
The figures I found were sales too, they were Q3 2012 sales and Q4 *may* show something more interesting, but I think doubling the sales share is a touch optimistic. Could well be wrong
The N900 was a great device, but I'm not interested in what the OS *needs* for basic operation, I'm interested in what you can do with the available power. And the more the better as far as I'm concerned. Especially as I like to re-purpose devices and install non standard operating systems. You can say "Oh but the interface is sooo smooth" as many times as you like, but I'll still be miffed at someone trying to sell me last year's hardware at this year's prices.
No, I do not expect everyone to think that way, or that my opinion is representative of anyone but me.
What are the sources for your numbers?
The 2.7% US figure I quoted comes from Forbes - http://www.forbes.com/sites/kellyclay/2012/12/21/windows-phone-now-third-most-popular-platform-in-u-s/
And gartner says 2.4% - http://wmpoweruser.com/gartner-around-4-million-windows-phone-units-sold-in-q3-2012-with-2-4-market-share/
These are of course Q3 numbers, I can't find Q4, but the only numbers I've seen even in the same ballpark as yours are projections. For 2016.