I am going to indulge myself in one of my pet peeves.
The difference between "X percent" and "X percentage points". It is not a minor niggle because one can end up drawing mistaken conclusions from the given set of figures. To whit:
"Windows Phone devices also saw a year-on-year improvement, rising 0.9 per cent to reach 4.6 per cent,"
No they did not. The increase was (if I have not made a cock-up here myself, which is quite possible) 0.9 percentage points which on a difference year on year going from 3.7% to 4.6% is a year on year increase of 30 percent. Though having said that of course I doubt that Ballmer is about to break out the champagne any time soon - a very small market share is still a very small market share. It would just be nice if we discussed such figures with a modicum of care and precision, hmm...?