SAN FRANCISCO, United States (AFP) — Microsoft on Friday announced that co-founder Bill Gates has left its board of directors to devote more time to philanthropy. The 64-year-old stopped being involved in day-to-day operations at the firm more than a decade ago, turning his attention to the foundation he launched with his wife, Melinda. Gates served as chairman of Microsoft’s board of directors until early in 2014 and has now stepped away entirely, according […]