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Computerworld - Microsoft's Windows 7 took just three months to reach a penetration benchmark that Vista needed almost a year to make, Web measurement firm NetApplications.com said today.

Windows 7 finished January with a 7.5% usage share, a mark the little-loved Windows Vista didn't attain until 11 months after its January 2007 debut.

"There's no slowing of the Windows 7 growth curve," said Vince Vizzaccaro, executive vice president with Net Applications, who also noted that on Sunday Microsoft's newest OS accounted for more than 10% of all machines that were online. Windows 7's share typically climbs on weekends and holidays, as more of the people online are running home computers, which are more likely to run the new operating system.

During January, Windows 7's weekly averages increased steadily from 7.2% to 7.4%, then to 7.6% and finally to 8% in the final week. For the month, Windows 7 was up 1.8 percentage points, its second-biggest one-month increase.

As in recent months, both Windows XP and Windows Vista lost share in January as Windows 7 gained ground. Windows XP slid to 66.3%, down 1.46 percentage points, a new single-month record that erased the 1.43-point decline of November 2009. Vista, meanwhile, lost 0.5 of a percentage point to end at 17.4%. Vista has now lost usage share three months in a row, and in four of the last five months, solidifying the trend that points to a permanent decline as users abandon it for Windows 7.

If the trends of the last three months persist, Windows 7 will overtake Vista as the second-most popular operating system -- and grab the No. 2 spot behind XP -- in June.

This isn't the first time that NetApplications has compared the uptake of Windows 7 with its predecessor. Last November, Vizzaccaro noted that Windows 7 had reached a 4% share in just three weeks, a mark Vista needed five months to hit.

The bulk of Windows 7's gains have come at XP's expense, not surprising since the eight-year-old-and-counting OS is the most popular on the planet by a huge margin. Since Windows 7's late October 2009 debut, Windows XP's share has dropped nearly three times more than Vista's.

Apple's Mac OS X climbed slightly last month, finishing December with a 5.13% share after an increase of just 0.02 of a percentage point. It was the first gain posted by Mac OS X in NetApplications' data since October. The small rise is no indicator of Mac sales, of course, which Apple announced last week had set a new single-quarter record of nearly 3.4 million units worldwide.