Is this a good time to sell shares in Microsoft Corp? The question is one of the main points of discussion by investors on the net and now the company’s president Bill Gates has put his own view forward – by selling off 2.15 million shares to raise $280m. What Bill – the world’s richest man – will do with the money is not known but his interest in biotechnology and cracking the secrets of DNA is well documented and it would be no surprise if he threw further money at cracking the problem of the human operating system.