https://www.linuxquestions.org/linux/answers/Applications_GUI_Multimedia/Howto_migrate_from_Thunderbird_to_Evolution
https://askubuntu.com/questions/519728/migrate-from-thunderbird-to-evolution-without-re-downloading-imap-mails https://unix.stackexchange.com/questions/42156/is-there-an-easy-way-to-migrate-from-thunderbird-to-evolution https://ubuntuforums.org/showthread.php?t=952152
