According to StatCounter, MacOS is gradually taking share from that other OS in North America.That’s about the only place in the world MacOS is popular in terms of units. I guess it’s a commentary on people wanting to spend money for IT they could get for $0 if they only knew. Perhaps it’s a commentary on people not knowing.

Source: StatCounter Global Stats – Operating System Market Share

See also Royal Pingdom on the global distribution of MacOS love. We know from SEC filings that Apple only sells about 16 million units annually so there aren’t many left for other parts of the world. Fully 1/3 of Mac sales are in the Americas.