Look at the Xbox. They pretty much said "hey, we'd like to make video games", and a few years later are a major major player in the market (before the Wii, it looked as if the game was just Microsoft and Sony, and Sega and Nintendo were looking like also-rans.) Similarly, think of IE, and the amazing market share it has (its fading a bit, but there was a while when it looked as if Microsoft didn't care about IE at all...)

Its one thing to say "gosh, Microsoft has sucked at this internet thing", but another to say that they're not in the game. Microsoft has proven again and again that they can say "hey, we want to win" and they take the market by storm.