But Belfiore's tweet doesn't even mention what is really bothering the analysts, which is that on a quarter to quarter basis, Windows Phone sales were declining. In other words, while the fourth quarter of 2013 looked good in comparison with the same quarter in 2012, activations actually declined when compared to the third quarter of 2013. And when you're looking for momentum, you expect to see solid gains sequentially.
Nokia's Lumia sales declined from 8.8 million in Q3 to 8.2 million in Q4. While Windows Phone continues to show improvement from the previous year, that momentum could be slowing based on Nokia's numbers and that would indeed be surprising.
Microsoft's Joe Belfiore thinks that the glass is half full
source: @joebelfiore via WMPoweruser