I have this exact situation with my wife's work laptop, which can't upgrade to windows 11. The requirements are pretty simple, something that runs Chrome and Dropbox as well as Microsoft Office 2007.
I'm going with Mint Cinnamon for her (I use arch & kde btw) - was pleasantly surprised to see Dropbox now has Linux support actually, haven't looked at it for years!
Almost everything she uses her computer for runs in Chrome.
If you don't open external files there is no problem? We paid for it and it does the mail merge so that's what we use. Been looking for Linux alternative with the same functionality and no luck so far, LibreOffice is almost but not quite good enough. Nobody else does mail merge from spreadsheet?
Now? i am pretty sure I have had dropbox on my linux machine like 10 years back, definitely back when AntergOS was still a thing and even before I remember having it
I looked it up there was an issue with btrfs just after they started Linux version which was why I stopped using it. That was a long time ago you are right, seems to be resolved now.