Nadella understands something most CEOs don't: The core business of any business is making money. Ballmer thought Microsoft's core business was Windows, Nadella

Nadella understands something most CEOs don't: The core business of any business is making money. Ballmer thought Microsoft's core business was Windows, Nadella understands it's software as a whole. Ballmer thought for MS to win, Linux had to lose. Nadella understands as long as MS is selling software and services, they win. Ballmer was a great number-two for Gates, but not a leader. Not everyone has it, and that's ok.