Emil Protalinski, VentureBeat:

Apple CEO Tim Cook announced during the company’s “More in the Making” event in New York City that Apple has hit a new milestone: 100 million active Mac users. He added that 51 percent of Mac buyers are “new to Mac” and noted that in China that figure is 76 percent, highlighting growth in the world’s most populous country.

And:

By comparison, there are about 1.5 billion active Windows PCs.

Consider this point, made on Twitter by Horace Dediu:

40% of all Macs ever sold are still in use.

I wonder if you ignored the first 10 years of Mac purchases, if that 40% number would drop, even to 39%. To me, this says a ton about the impact the success of the iPhone and the evolution of the Apple ecosystem has had on the Mac.