Comment 4 for bug 1875895

Thank you for your bug report, your post makes sense and describe some known issues

* The fact that thunderbird doesn't integrate with the GNOME online accounts is bug #1586678

* The gnome-software issue could have to do with the fact that you installed another format than the deb?

* Changing back to use evolution by default is being discussed there
https://discourse.ubuntu.com/t/evolution-again-as-default-email-app-client/15457