Mac OS X and Linux both lost share in December, with the former down two-tenths of a point to 7.1% and the latter off less than one-tenth of a point to 1.2%. Apple's operating system finished the year up seven-tenths of a percentage point, while Linux was down two-tenths of a point.
Net Applications measures operating system usage by tracking unique visitors to approximately 40,000 sites it monitors for clients.
Gregg Keizer covers Microsoft, security issues, Apple, Web browsers and general technology breaking news for Computerworld. Follow Gregg on Twitter at @gkeizer, on Google+ or subscribe to Gregg's RSS feed. His email address is email@example.com.
CAPTION: In December, Windows 8's uptake pace fell behind Vista's for the first time. Both were lethargic compared to Windows 7's trajectory in late 2009. (Data: Net Applications.)
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