I just can’t find a decent email client that looks like it’s from the last 20 years. Geary and Evolution both appear to be pretty modern but something about using Gmail with a Yubikey just doesn’t work and neither of them will connect to my account. Both on Fedora and OpenSUSE. Thunderbird works but it’s so old fashioned and Betterbird doesn’t look much better. What’s everyone else using?
I recently (months ago) switched back to Evolution from Thunderbird. I used both of them several years. I had a webmail phase in between. Thunderbird has/had enoying issues displaying mail threads.
For calender I switched to gnome-calendar, because it looks very modern.