If there is someone at Microsoft who didn't got enough credit it was Ray Ozzie. Remember him when he was Chief Software Architect? He started Azure / Microsoft transition to the cloud. He created that shift in focus that Microsoft now rides on. Had he not gotten that brief period as BillG's replacement, Microsoft would have continued to live in the past where windows and on-premise office suite was king. Ray Ozzie changed the direction of Microsoft without ever really getting any credits for it.