Operating system marketshare data from Quantcast reveals 10.9 percent of online users in North America are using Mac OS X, an increase of almost 30 percent over the past year. Geographic data shows Apple does very well in North America and Oceania, but not so well in third world countries, which isn't really a surprise as the average Mac costs a lot more than the average PC.
Around the world, Apple is also doing well in Oceania, with 8.6 percent market share, and Europe, with 4.7 percent. Though Europe lags Apple's global performance a bit, it's worth noting the company has recently broken into the top five PC vendors in both the UK and France recently, even as the market in Western Europe has been relatively flat. We expect Apple to gain some share in this region in 2010.
Mac OS X only accounts for about 2.5 percent of users in Asia. The two most populous countries in the world, China and India, have an even lower percentage overall—1.9 and 1.2 percent, respectively. Japan is likely responsible for the majority of Mac OS X share in that region.