that analysis is totally unconfirmed and doesn't even take in account the Apple Store ...I'm not so sure about that.
Granted MS only outsold Apple only for the month of October, so it's not proof that MS is "winning the war" or whatever. But it is proof that there is consumer interest, and people are buying the Surfaces in fairly large numbers.
Last quarter analysis said a completely different thing:
http://www.theverge.com/2015/10/22/9599674/microsoft-q1-2016-earnings
Let see next quarter.