Gorilla ...
It's odd to watch the slow 'shrinkage' of the 800lb gorilla in the room, too big and unwieldy to change quickly, too assured of it's own power to pay much attention to competition before it's too late.
Lets see, microsoft late to the party on:
Mobile devices
Online music services
Tablet devices
Browser technology
They keep relying on the installed user base as an excuse to ignore the obvious - they are being resoundly trounced in the online market, the mobile market & the entertainment market.
It's been a slow decline, microsoft still hold a massive amount of sway in many areas, but they're not the company they used to be, hardly suprising, considering the numpty that's in the driving seat - the great denialist. He tries to 'spin reality' like Jobs does, but he doesn't have the figures to carry it off.