Bill Gates, Jerry Seinfeld ad airs - Apple has nothing to worry about
It would probably be bearable if the 90 second commercial were at least funny. But really, it's not. The point is apparently to introduce the audience to the characters and the funny will come in later ads. Presumably so will information about Vista. But seriously. 90 seconds of nothing? The very first Mac vs. PC ad weighed in at around 30 seconds, was funny, and didn't require much setup. If this is the best Microsoft's ad team has to offer, Apple doesn't have much to worry about.
On the other hand, while Apple continues to gain popularity, Microsoft still dwarfs the company in terms of market share. So maybe Microsoft doesn't really need to follow the format set by others.