There's a new ad from Apple on TV. It's another one in the "Get a Mac"/"I'm a Mac\and I'm a PC" ad series.
This one has PC excitedly telling Mac about the upcoming (then) release of Windows 7, saying it won't have any of the problems of Vista. Mac says he's heard this before, and the ad cycles backwards in time with PC giving the same reassurance for the release of Vista vs. XP, XP vs. Me, Me vs. 98, 98 vs. 95, and 95 vs. 2. Then, the ad finally goes back to the present with PC reassuring Mac that this time he means it.
Yes, they also skipped Windows 3.X, but I'm not so concerned about that.
What does strike me as odd is their omission of Windows 2000.
Most likely the omission was due to time constraints on the ad. However, one could argue that Apple genuinely thought of Windows 2000 as a good OS and not a joke (vs. Mac OS/OS X).
Windows 2000, in my opinion, is one of the most stable, secure, and fast versions of Windows I've ever used. XP pales with respect to stability and security, Vista with respect to security and speed, and 7 with respect to speed.
Despite Windows 2000 not being open-source, I think it is still one of the best OSs Microsoft has ever released, and it is quite good on its own as well. Apple recognizes this, so maybe their omission of this OS in the ad was a conscientious decision with respect to this.