Pretty much all their other stuff is stuff that either works fine on Linux or is just in the browser anyway, but the only thing that I don't really have a rebuttal to is when my dad points out that he uses the full-fat excel and a lot of the more modern features.
I would so rather they move to Linux, and just put Excel inside Winboat or something, but they won't have it. Annoying since I'm still expected to play tech support for them and Microsoft's recovery tools do not work, and as far as I can tell have literally never worked for anyone in human history, and I'm not entirely convinced that the people at Microsoft have ever tested them.