"[B]ased on Appleâs June 2012 announcement that there are currently 66 million Mac users in the wild, we can infer that 2.11 million Mac users downloaded OS X Mountain Lion in the past 48 hours,â Chitika said. âUsing this figure, if we assume that 90 percent of these users paid to upgrade, OS X Mountain Lion generated $38 million in revenue for Apple in the past 48 hours."
Source: Chitika Insights
As noted by the publication, the exact number of paid downloads can't be verified as Apple is allowing users to update all their Macs for the one-time $19.99 charge.
Breaking down the numbers, Chitika said Mountain Lion's usage rate after 48 hours neared that of Mac OS X 10.4 Tiger. Most Mac users are still working on machines running Mac OS X 10.6 Snow Leopard which accounted for 45 percent of web traffic.
"It is rather impressive for an operating system to capture 3.2% of market web usage after just 48 hours on the market. Such figures are likely supported by a relatively low price point for the operating system as well as an expansive list of desired feature improvements," Chitika writes.