OpenAI and Microsoft said Thursday they have reached preliminary terms on a revised partnership and are "actively working to finalize" a definitive agreement.Why it matters: The deal with Microsoft resolves a major hurdle in OpenAI's planned corporate restructuring, but it still must be approved by regulators.The big picture: OpenAI and Microsoft have one of the most high-stakes partnership in history, with the software giant having spent billions to get first dibs on the ChatGPT maker's techno...