 Muglia announced his resignation from Microsoft in January 2011 ; he was replaced by Satya Nadella , now Microsoft 's CEO . He was the fourth executive reporting directly to Microsoft CEO Steve Ballmer to resign between early 2010 and 2011 . According to Financial Times , Ballmer credited Muglia for growing the servers and tools division , but implied the departure was related to disagreements between the two executives about the company 's cloud computing strategy . 
