You guys don't get it. That is the whole point of the ad itself. Up until this point there hasn't been any Microsoft ads at all. Know why? Because the product sells itself. The only reason they are doing this ad campaign is to 'up' the image of Microsoft. Not to sell more OS's, not to sell more software. The entire point is so the public gets a better view (more personable) of Microsoft as a company. That's why they don't say anything about Mac, Vista, Office, nothing, because it isn't about their products. It's just about making a stupid commercial to make you laugh - that is it.
Did you guys expect something hillarious about MS making fun of Mac? Think they've done enough in being 99% of the computers in the world, nough said. They just want to up their brand image, that is it, period.