Bill Gates was investigated after being accused of having an affair with a Microsoft staff member for several years. The 65-year-old billionaire, who recently announced his divorce from wife Melinda after 27 years of marriage, was subjected to the probe last year after an engineer alleged in a letter that she had a sexual relationship with Mr Gates around 20 years ago. Microsoft chiefs decided it was ‘not appropriate’ for co-founder Mr Gates to continue sitting on its board as a result, The Wall Street Journal reported. But Mr Gates was thought...