Sam Altman attacked a member over a research paper that discussed the company, while directors disagreed about who should fill board vacancies open for months.
Mr. Nadella moved fast to hire Sam Altman, who was pushed out of OpenAI on Friday, and asserted his company’s role in its partnership with the A.I. start-up.
Big Tech is reeling from the ouster of Sam Altman at a leading A.I. start-up and his subsequent jump to Microsoft, moves that reset the power dynamic underpinning the sector.