Microsoft Corp Chief Executive Satya Nadella has appointed pollster and longtime corporate adviser Mark Penn to the role of chief strategy officer, according to a memo sent to company employees on Monday. Penn, who has advised co-founder Bill Gates and Microsoft since the mid-1990s, made his name working with President Bill Clinton between 1994 and 2000. He joined Microsoft full time in 2012. Nadella said in his memo, a copy of which was obtained by Reuters, that Tony Bates, head of business development, would leave the company.