Another smart move by Microsoft was shipping Xboxes in an uninitialized state that has to connect to the internet and download the latest firmware before it can be used. Sony has been repeatedly burned by patching an exploit but having the vulnerable firmware still pre-installed on machines still in retail channels, so someone willing to abuse return policies can easily get one. MS doesn't need to worry about that, every new Xbox ends up on the latest firmware regardless of when it was manufactured.