Windows 7 hit the market? So much has happened in the interim, we could swear it's been a decade. Of course, Microsoft is celebrating Windows 7's birthday the best way it knows how: sales numbers. Turns out the little OS has done pretty well for itself, with 240 million licenses sold, giving it a 17 percent global operating system market share, and making it a healthy chunk of the 1.2 billion Windows PCs out there. As for the slow-to-adopt businesses out there, Microsoft still has some work to do, but it says 90 percent of companies have upgraded or "started their move" to 7. So, we've got the cold hard facts out of the way, any precious, personal, heartfelt memories of your time with the OS you'd like to share? We've got dibs on Steve Ballmer dropping by the Engadget Show on launch week.