Microsoft and Apple are dominating in very similar ways when it comes to gaming consoles (Microsoft) and mobile (Apple).
Yet Microsoft hasn't been able to replicate this winning strategy with its own phones. It seems to me that if one department at Micrsoft is "killing it", it would be Xbox. Yet that's the last thing anyone talks about.
The $20 billion / year in sales server and tools does, is three times the size of the XBox + Live group.
In phones MS has been ahead, then utterly disrupted, then made valiant come-from-behind efforts. But the problems they are faced with are different than they're used to. With phones they're fighting against the network effect of competitors. They need to not just be a little better than the competition, they need to be a lot better. Also, look at how much money both MS and Sony spent buying up game studios and exclusive content for their consoles and compare that to the relatively weak outlays in the same vein for mobile content.