Microsoft founder Bill Gates, the world's richest man, said today the tax office in the US has to store his financial data on a special computer because his fortune is so vast. "My tax return in the United States has to be kept on a special computer because their normal computers can't deal with the numbers," he said at a Microsoft conference held in Lisbon. "So I am constantly getting these notices telling me I haven't paid something when really it is just on the wrong computer," he added in comments broadcast on television. "Then they will send me...