They had a solid track record of crushing their opposition, by starving them of money (vs. Netscape), depriving them of critical applications (Apple with Office), or by throwing mountains of money at the problem (vs. Sony PS3).

Now they utterly own a few key markets, but have consistently failed to gain traction in others. Their online division is a disaster. Their console is set up for an apocalyptic flame-out. Their phone and tablet sales are already costing them billions in partnership deals and write-downs with almost nothing to show for it.

At this point Microsoft would be hard pressed to beat out Blackberry in the phone space.