Server Hardware and Server OS Reliability – 2009 Results – "Beauty of Bath":
Microsoft can't even get it's server OS right:
IBM's Power servers topped a list of most reliable x86 and Unix machines in a new survey, clocking in at only 15 minutes of unplanned downtime per year. Linux distributions running on x86 servers also performed well, as did Sun's Sparc machines and HP's Unix boxes. Windows Server machines performed worse than most competitors, with two to three hours of downtime per year, but have still improved dramatically over previous surveys.
That's much worse than Mac OS X on G4s:
Apple's G4 Mac servers with the Mac OS X operating system came in sixth with 37.8 minutes downtime.
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The next-worst were Windows Server 2003 on Intel-based hardware (three hours of downtime) and Windows Server 2008 (nearly two and a half hours downtime).
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