Unfortunately, the public APIs for the ribbon interface are broken to an extent. I havent checked recently, but as an add-on, it was impossible to get 2 excel windows to display different values in a textbox embedded in a ribbon for 2 sheets openned in the same excel process.

Despite the appearance of being separate processes because of separate windows, excel is basically a detached MDI interface where each sheet gets its own window, but same process. I think the other Office products are the same (but I'm not sure). I dont know how many hours I wasted at a previous employer trying to figure out what was wrong, but finally gave up after many frustrating hours.

That, as well as their new icons, the applications icons and even more so the icons inside the applications is terrible in my eyes. It feels like when your side lose the elections, the future is gloomy because of wrong decisions someone else took and you have zero control over it, while they have so much effect on you.

That’s probably why Office 365 freezes a lot when you unplug screens and also sometimes renders a little blurry. They haven’t made it better.