Microsoft's share of the operating system market is dropping, while Apple computers and handhelds have topped 10 percent for the first time, according to a new report on Internet-connected computers.

NetApplications, the company that tracks browser and operating system market share for a variety of sites across the Internet, released its data for December 2008. According to a Computerworld analysis, the number of Windows users decreased in December by 0.94 percent to 88.7 percent.

The fall was the steepest in four years since Net Applications began collecting data, and was also more than twice that of any similar period in the previous three years. The Computerworld article does note that December statistics do slant slightly towards the Mac due to the reduced number of in-office days for corporate users, but the overall shift is decidedly Mac-ward even once that's accounted for.

Apple's share is just over 10 percent, if one combines the market share for both Macs and iPhones. Macs account for 9.63 percent of computers online. (Windows Mobile devices are included in the 88.7 percent figure.)

Also of note, almost three quarters of Macs online have an Intel processor. This time last year, less than half had one. Overall, Mac OS X's share grew by 31.7 percent compared to a year ago.

Windows XP remains the operating system with the largest installed base, with over 65 percent of the market.

Apple 2.0's Philip Elmer-DeWitt notes some new Net Applications statistics that suggest 8.87 percent of all Internet users use a Mac: a new record.

Add to that the iPhone platform's 0.37 percent, and over one in eleven use an Apple product to browse the web. The iPhone gained 12 percent more users compared to the month before.

Also notable is that Windows users accounted for less than 90 percent of Internet users for the first time in recent memory. Also, market share for Internet Explorer dropped below 70 percent for the first time since its popularity surged in the late 90s.

Linux also gained ground, increasing almost 17 percent to 0.83 percent of all Internet users.

Net Applications tracks statistics from over 160 million visits to websites it monitors. The full report is here.

This post is for Apple fans who enjoy obsessing over minutia. The latest Net Applications survey has been conducted and shows differing results for Mac OS X users and iPhone users.

Net Applications measures the percentage of users who visit some 40,000 web sites from a given operating system. In February, the number of Mac users dipped slightly to 7.45% from 7.57% in January, while the number of iPhone users rose to 0.14% from 0.13% in January (beating out the Playstation and Wii).

Windows still accounts for 91.58% of web users, according to the survey. What this means is A.) Most people have windows (we knew that), B.) Some people have Macs (we knew that), C.) iPhone users like to surf the web (we knew that) and D.) People love talking about very small percentages. Awesome.

[Via Macsimum News]

That's up 76 percent from last year. And we're still talking about a 3.19% browser market share, according to Net Applications. Of course, as stated on the Surfin' Safari blog, the hope (for Apple) is to see more WebKit-based browsers out there too. You may recall Nokia's S60 web browser is just such a beast. Whether or not a cell phone browser will make a dent in WebKit's market share? I'll let you decide that one. In the end, I can really only hope all this great market share business is going to make some developers out there (you know who you are) work a little harder to make their websites Safari-compatible. List the worst Safari offenders in the comments, and just ignore Google, where everything is beta. Besides, it could be worse: you could be using Opera.