Nadella is in charge of Microsoft's $15 billion server and tools business (STB). The executive is responsible for its technical direction, strategy, operations, engineering and marketing. What makes Nadella, who was appointed to this position in February of 2011, a compelling choice is his broad experience which took him from Sun Microsystems in the early 1990s, to Microsoft's server engineering, ERP and CRM products, business solutions and its online services division. Nadella is now leading the effort to drive the just released Server 2012 OS into enterprises and tie it to its database, middleware, productivity, and cloud computing products. While Scott Guthrie, Corporate Vice President, Server & Tools Business, is a much more public figure than Nadella, it is Nadella who has to make sure that Microsoft's rapidly changing server products find buyers in a market in which Microsoft has to adapt to a “services” rather to a “local software” environment.