Well, look no further, you have found the article with the final answer (at least to me).

What's the role of a Program Manager in an enterprise like Microsoft? We get this question many times. Luckly a friend of mine, Matthew Roche, recorded a video where he explains in detail, and IMHO in the best way possible, what a PM is and does in Microsoft.

So, if you are interested in learning more about the role, as you know we're always looking for talented people, you're probably interested in the website I built during the latest winter vacations.

I took the transcript of the recording and made it more accessible and easier to be discovered and consumed, so that everyone, e-v-e-r-y-o-n-e, can enjoy Matthew's work.

https://aka.ms/being-a-ms-pm

Enjoy (and share! :))

PS
In the meantime, I also enjoyed doing everything in a modern way, using GitHub as the source repo and GitHub Actions with Azure Static Web Apps to make it extremely easy to update the website. And I encourage you to help to make the site better if you find something you think can be improved. (And I'm sure there are a lot of things that can be improved...from the quality of the transcript to some better JavaScript effects or nicer look and feel)

https://github.com/yorek/ms-pm