Microsoft CEO Steve Ballmer is planning his retirement in the next nine months from the software giant he helped build, but he’s also assisting with a reorganization for his successor. In exclusive interviews with The Wall Street Journal, Ballmer recounts what led to his surprise resignation announcement from Microsoft in August. Microsoft’s board had been rightly pushing Ballmer to go faster. Lead director John Thompson had been pushing Ballmer to move faster as competitors gained ground on key consumers markets like smartphones and tablets.