The new NetMarketShare figures for December 2010 show that Microsoft Windows 7 now has 20.9% of the operating system market, as measured by visits to the websites that NetMarketShare monitors. It gained 1.2 percentage points on the previous month, and has gained 15 percentage points since December 2009.
Windows XP still represents the largest slice of the market, with a share of 56.7%, ahead of Windows Vista (12.1%) and Mac OS X 10.6 (3.1%). XP has dropped 11 percentage points since December 2009.
Lower down the scale, Apple's iPhone (1.02%) has overtaken Linux (0.96%), while the iPad (0.52%) is increasing its market share as measured by general web site access.
In the browser market, Google's Chrome has also reached a notable milestone, with a market share of 10.0%. Of course, Microsoft's Internet Explorer is still the market leader, with a 57.1% share, followed by Firefox (22.8%).
In terms of browser versions, IE8 is the most popular (33.0%), followed by Firefox 3.6 (18.5%), IE6 (13.1%), IE7 (8.8%), Chrome 8 (7.3%) and Safari 5 (3.2%), according to NetMarketShare figures.