Windows steals top server OS spot from Unix | at | by Mike

Microsoft's Windows edged out Unix in 2005 as the best-selling server operating system, research firm IDC said Wednesday, marking the first time Unix hasn't held the top spot in more than a decade.

Windows servers accounted for $17.7 billion in revenues last year, the Framingham, Mass.-based research company said, while Unix-powered servers took in $17.5 billion.

The trend of Microsoft besting Unix appears to be accelerating, noted IDC. Windows server sales climbed 4.7 percent in the fourth quarter of 2005, year-over-year, while Unix server revenues dropped 5 percent. Linux, meanwhile, posted double-digit year-over-year growth: fourth quarter 2005's numbers were 20.8 percent higher than 2004's.