Though, I wonder what they include in those numbers.
I've got an SE/30 which I fire up sometimes, running System 6-something. Does that count?
And I've got a Powerbook 1400cs, which I've got sitting on my kitchern table, too.
I've also got a box of parts which, put together, probably adds up to a Lombard.
My understanding is that the 22 million is installed Pre-Leopard OSX. It does not take "Classic" OSes like OS 6 - 9, which there is a surprising number still out there.