It's a milestone in the life of any OS: the day you reach that magical 10,000 app number. Windows Phone 7 is the latest kindred soul to achieve the feat, accomplishing the task in just over four and a half months -- that's faster than both the Android Marketplace and iTunes App Store. Microsoft's been adding around 1,000 apps a week since it hit 5k right before the New Year, and as of late that rate's been picking up. Congrats WP7 devs, you've officially issued more software updates than Microsoft itself. Your move Microsoft, we're still waiting for copy & paste.