content: Um... You can't release complete OS. You have to update it constantly. Just like Ubuntu gets updates and new features.  Except Ubuntu isn't vulnerable to any random hack patched or unpatched. With Windows it seems you get hacked if you don't stay updated, but get spied on if you do. You might get spied on either way and hacked either way, though. Then again, who's to say the spies and the hackers aren't the same people. Microsoft will go up a notch in my book, however, if they do have improved backwards compatibility.