March 13 (UPI) -- Bill Gates has stepped down from Microsoft's board of directors to focus on his philanthropic efforts, the company announced Friday. Microsoft said Gates, the co-founder of the company, will continue in his role as technology adviser to CEO Satya Nadella. Advertisement "I have made the decision to step down from both of the public boards on which I serve -- Microsoft and Berkshire Hathaway -- to dedicate more time to philanthropic priorities including global health and