Alright, fine! I'll go back to lurking on Fark...

http://gizmodo.com/5051682/microsoft-ads-featuring-bill-gates-and-jerry-seinfeld-not-canceled

The judge in the anti-trust case limited the "relevant market" to x86 machines. Meaning that Apple's existence or demise wouldn't have affected the ruling (and didn't affect the the appeal much either).

Jobs has said that accepting Microsoft's investment was largely a way to attract attention -- ANY attention -- at a time when Apple was largely being ignored. I'm sure Gates' reasonings had to do with ego... "bailing out" his rival.