That depends entirely on the final contracts they signed with OpenAI Global, LLC and I think there have been at least two deals so far (and latter ones might have amended the previous ones).

Based on their blog post [1] and various rumors in the press, it sounds like Microsoft has some contingencies in place. I assume their investments will just convert to hard equity in case of a sale (if they haven’t already).

[1] https://openai.com/index/why-our-structure-must-evolve-to-ad...