I have used mbsync and seems to be a great tool. In order to view those emails I used neomutt and works pretty ok, is there a way to access those email archives with a GUI-based email client (e.g. Thunderbird) without converting them to MBOX? My dad is not going to use a MUA for reading old backups of mails, I thought about setting up a local IMAP server (dovecot) and try to access that via Thunderbird but could not make it work at all...someone with a similar experience or some insights?