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LONDON - MARCH 2: (NO UK SALES FOR 28 DAYS) HRH Microsoft founder Bill Gates and his wife Melinda pose for photographs after Gates is awarded an honorary knighthood at Buckingham Palace on March 2, 2005 in London, England. Mr Gates received a Knighthood from Queen Elizabeth II in recognition of his outstanding contribution to enterprise, employment, education and the voluntary sector in the UK, and his contributions to poverty reduction . (Photo by Tim Graham Picture Library/Getty Images)

LONDON - MARCH 2: (NO UK SALES FOR 28 DAYS) HRH Microsoft founder Bill Gates and his wife Melinda pose for photographs after Gates is awarded an honorary knighthood at Buckingham Palace on March 2, 2005 in London, England. Mr Gates received a Knighthood from Queen Elizabeth II in recognition of his outstanding contribution to enterprise, employment, education and the voluntary sector in the UK, and his contributions to poverty reduction . (Photo by Tim Graham Picture Library/Getty Images)