Well, since you got some negative reactions to this post, I think I should state that I agree with you; specifically, the following part seems quite relevant:
The drive ... was that, to me, 'not a strategic product' is a conclusion rather than a reason.But I doubt we will get more detailed information, about MS's motivation.
Difference in opinions hath cost many millions of lives: for instance, whether flesh be bread, or bread be flesh; whether whistling be a vice or a virtue; whether it be better to kiss a post, or throw it into the fire... (from Gulliver's Travels)