30 seconds in and you can already tell this isn't worth watching. Apple didn't steal 42% of PC market share, their market share increased 42% (and I'm just assuming the 42% is correct) which means it went to like 3%

It was a good ad. But also, Mac OS X at the time was so vastly and obviously ahead of Windows, it was a very natural choice if your circumstances allowed it (IMHO etc). It really really didn‘t break Microsoft. They were, and are still, more than fine.