Migadu do have calendar/contacts but it's a bit tricky setting up, FYI. Edit: For example, take a look at https://www.migadu.com/guides/thunderbird/ https://ww

Migadu do have calendar/contacts but it's a bit tricky setting up, FYI. Edit: For example, take a look at https://www.migadu.com/guides/thunderbird/ https://www.migadu.com/guides/thunderbird/ and at the end of that page there's some instructions for setting up calendar.