Windows on verge of dropping below 90% market share

is on the verge of dropping below 90% market share, with and tablets posing an increasingly serious threat to 's dominance of the operating system market.

-- which lumps mobile and desktop operating systems into one statistic -- show that Windows market share dropped from 93.74% in February 2009 to 90.29% in December 2010. Windows was still above 92% market share as recently as February 2010 but suffered steady losses during the rest of the year.


"The operating system usage market share trend line points to Windows' overall usage falling below 90% sometime during 2011," says Vince Vizzaccaro, executive vice president of marketing and strategic alliances for Net Applications. "The timing depends on several market forces. It could be as early as next month, or possibly not at all."

Microsoft's continued dominance of the desktop operating system market will likely not be enough to keep Windows' total share above 90%, because the proliferation of smartphones and tablets is changing the definition of what a personal computer is. Microsoft's mobile efforts revolving around in tablets will be crucial for Redmond.

IT analyst Jack Gold, predicts "By 2013, greater than 67% of browsers accessing the Internet will be on non-PC devices. Internet Explorer will ultimately become a minor player in the browser market, with WebKit-based rendering engines powering the majority of mobile devices, and Mozilla-based browsers being deployed on -based (and ) larger form factor products. As a result, websites will no longer be optimized for PC-based Internet Explorer, but will standardize on WebKit and HTML5 for broad-based browser compatibility."