Watch a timeline of the drama between Sam Altman, OpenAI and Microsoft

Hundreds of OpenAI employees have signed a letter threatening to join former OpenAI CEO Sam Altman at Microsoft if OpenAI’s remaining board members resign. Altman was forced out of OpenAI on Friday by the company’s board over communication issues. OpenAI’s chief technology officer Mira Murati was appointed as interim CEO following Altman’s ousting.