Also: In my experience, Office Copilot¹ is simply not a competitive offering. For several months I spent fractional time trying to get a simple — meaning, thoughtful and substantial prompting and knowledge, but no custom actions — project working on Office Copilot (using Copilot Studio) as well as it did as an OpenAI GPT, but never could.

Our IT Prevention Department even arranged a meeting with Microsoft folks at some point, and the Microsoft folks couldn't offer any useful direction. It was like pulling teeth to even get them to confirm which model Office Copilot Studio was using. It just doesn't feel like Microsoft is very serious about Office Copilot once you get beyond surface-level "write this Excel formula for me" use cases.

(¹ Calling it this to disambiguate from "GitHub Copilot".)