Former Microsoft CEO Steve Ballmer may be the most energetic owner in the NBA right now, but Microsofties were less enthusiastic about him sticking around. Ballmer announced this morning he is leaving the company's board of directors to focus on other things, most notably teaching and his new basketball team the Los Angeles Clippers. Ballmer was a fierce leader of the company for more than a decade, but people have been calling for him to step down for years so the company could move in a new…