Steve Ballmer couldnt change Microsoft fast enough. During his 13-year stint as CEO, the company failed to get in front of major technological developments. It struggled to keep pace with the likes of Apple and Google in mobile and search and saw lackluster adoption of its first round of tablets. Ballmer created a sluggish corporate culture that pitted employees against each other, and he wasnt moving fast enough to right his wrongs. It was time for him to move on.