Microsoft CEO Satya Nadella.Getty ImagesSatya Nadella transformed Microsoft by focusing on cloud computing and open-source software.Nadella also envisioned shifting Microsoft's culture from "know-it-alls" to "learn-it-alls."Here's how Microsoft's big bets on AI have helped boost its market value to more than $3 million.When Satya Nadella took over as CEO of Microsoft in 2014, he was on a mission to transform the company's culture.A few months into the role as its CEO, the former engineer laid out his vision in a memo to staff.He said, "We must each have the courage to transform as individuals…With the courage to transform individually, we will collectively transform this company and seize the great opportunity ahead."A decade later, it's clear that Nadella followed his own counsel as he seeks to establish Microsoft as a dominant force in AI.When Nadella first took over, one of his first acts was to make it clear that he wanted Microsoft to stop being a "devices and services" company and to pivot to cloud computing and open-source software, despite the fact that its acquisition of Nokia was only finalized that same year.But Nadella's predecessor, Steve Ballmer, orchestrated the deal.