The tech billionaire writes a poignant tribute to his dad, who was 94 and suffered from Alzheimer disease. Bill Gates of Microsoft fame says one of his most treasured possessions is a letter his father wrote to him when he turned 50, calling the experience of raising Bill and his two sisters incredible. William H. Gates, the father of Microsoft co founder and billionaire philanthropist Bill Gates , died on Monday, his son wrote in a poignant post on his GatesNotes blog . William Gates was 94....

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