Microsoft's CEO has testified in a trial involving Elon Musk and OpenAI, discussing the firing of Sam Altman from OpenAI. The CEO reportedly stated that Musk never raised concerns to him about Microsoft's investment, and also mentioned that Microsoft was prepared to continue investing after Altman's firing. Details about the circumstances of Altman's firing and the events surrounding it are being revealed through testimony, with some characterizing the decision as a 'hail mary'.