How Satya Nadella turned Microsoft around

WHEN SATYA NADELLA became the third boss of Microsoft in 2014 one photograph captured the moment. It shows him flanked by Bill Gates, the co-founder and chairman, and Steve Ballmer, Mr Gates’s successor as chief executive. The two white tech tycoons strike a confident pose in casual dress. Mr Nadella, an Indian-American, skulks in a suit, smiling awkwardly.