The market resolves to "YES" if a reputable source confirms that Microsoft has filed any lawsuit that is directly related to the OpenAI's "leadership transition" (i.e. firing Sam Altman) before the end of 2024. It resolves to "NO" if there is no such reputable source.

Background: According to Axios, Microsoft has invested billions in OpenAI, yet had no influence over the board's choice to remove their CEO, and was not even warned in advance. The price of $MSFT dropped after the announcement, and Satya Nadella released a statement affirming their continued support for the partnership. Given the enormous stake of their investment, it is reasonable to think that they will explore all possible legal options.

There are some other markets based on the possibility of a lawsuit, but they seem to focus on Sam Altman as the target. This market is specifically concerned with the legal actions taken by Microsoft, but it includes any potential targets (e.g. OpenAI, individual board members, Sam, etc).

If you have any questions about the resolution criteria in specific cases, please comment below, and I'll answer to the best of my ability.