Bill Gates is retiring, sort of. He is still only 52, and he is going off to spend more time guiding the world's richest philanthropy, the Bill and Melinda Gates Foundation. He will still be Microsoft's chairman and largest shareholder, but Friday is his last day as a full-time worker at the software giant, marking the unofficial end of his career as a business leader.
And what a career it has been. Mr. Gates has been an animating force behind...
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