[rhco]

This is one of my many peeves with Outlooks UX. You can do Ctrl+Alt+V, which gives you an option to paste unformatted, but it's much more finger-intensive than the other shortcut.

[zinekeller]

This is one of those rare times that you can trace it directly to Bill Gates. Another one is Ctrl+F as send and not find (https://devblogs.microsoft.com/oldnewthing/20140715-00/?p=50...)