Microsoft is having a bad month. Redmond is losing share in Web metrics as well as in the OS market. (Oh and people are buying up old PCs for the XP licenses)
In the broader operating system market (depicted below) you'll notice that Apple's OS's (Mac and iPhone) now operate at over 9.25 percent of the market. Microsoft dipped below 90% for the first time ever in this survey.
Firefox also had a great showing, scoring over 20% of the browser Marketshare for the first time ever. Safari and Chome also gained ground on Internet Explorer.