You're right using Microsoft products is like mixing Momento with Waiting for Gadot :)
I recently switched to New Outlook and it's full of weird subtle bugs. It takes them years to fix things and make them barely useable. Given their track record I'm not optimistic for Copilot given both the vision and the execution are questionable at best.
My employer installed the new Outlook in the background, and it was forcing me to switch to the new every time I use the old version.
I had to edit Windows Registry to avoid getting prompted every time I open old outlook. I didn’t like the looks or the bugs in the new version.