Outgoing Microsoft CEO Steve Ballmer has said that the failure of Vista was his biggest regret as CEO because it meant he had to devote more resources to fixing it and had fewer resources to devote to making a better mobile operating system. Daring Fireball’s John Gruber, however, thinks that Microsoft’s struggles in the mobile world go far beyond this and are instead fundamentally about the company not understanding the importance of the iPhone back when it launched in 2007. By now we’ve all seen the video of Ballmer dismissing the iPhone for being too expensive while saying that it would never succeed in the business world because it lacked a physical keyboard. In other words, he was making the