| The future of OpenAI appeared in limbo Monday, with hundreds of company employees signing a letter calling on the board to step down after it was unable to reach an agreement to bring back ousted CEO Sam Altman. Altman, whose departure from OpenAI was announced Friday, joined Microsoft early Monday following a weekend of boardroom drama that sent shock waves across Silicon Valley. Altman will lead a new artificial intelligence project at Microsoft, the tech giant said early Monday after rumors swirled that he could make a dramatic return to the company he helped build into one of the world’s hottest startups. | 