XP is going down in the Windows market, in order to make room for Vista, although the last operating system to come out of Redmond has had a rough ride since the launch.

Vista has managed to establish itself as Microsoft’s main source of income, driving a revenue of $4.14 billion. “Microsoft announced revenue of $13.76 billion for the quarter ended September 30, 2007, a 27% increase over the same period of the prior year.

Statistics made available by Net Applications at the end of September 2007, paint a picture that comes to confirm Microsoft’s own perspective over the consistent growth in Vista uptake. XP is credited with 79% of the operating system market, down from 85% in January, while Vista increased its foothold from 0.18% in the first month of 2007 to 7.38% at the end of September.