Microsoft has announced that Windows 7 has sold more than 240 million copies so far, meaning it is still the fastest-selling operating system. Windows 7 turns one year old tomorrow.

"As of September, Windows 7 was running on 93% of new consumer PCs and has over 17% global OS market share (according to Net Applications as of October 1st)," Brandon LeBlanc, Windows Communications Manager, wrote in a blog post. "There is an amazing array of great PCs out on the market today. Six months after launch, 100% (over 18,000) of our OEM partners were selling Windows 7 PCs versus 70% for Windows Vista PCs at a comparable time period."

Three months after release, Microsoft said more than 60 million Windows 7 licenses were sold. Doing some simple math, it appears that sales aren't slowing down much.

Although Apple's Mac OS X and Linux-based operating systems have won some market share in the past few years, Microsoft still controls well over 90 percent of the world's 1.4 billion or so personal computers. That said, the software giant is lagging behind in the smartphone and tablet markets, though it has plans on pushing Windows out to both.

If you're already on Windows 7, you should check out our guides for Microsoft's latest operating system. If you're not on it yet, tell us why in the comments below.