I've used Thunderbird for years with minimal requirements beyond just email but over the last year, I amped-up my needs. I needed more integrations for calenda

I've used Thunderbird for years with minimal requirements beyond just email but over the last year, I amped-up my needs. I needed more integrations for calendar and contacts with my self-hosted Nextcloud. I had to leverage plug-ins for Thunderbird and they were problematic but kind of worked most of the time with caldav and carddav data sources. Earlier this year, I reset my Thunderbird profile and tried the updated non-plugin setups and it has been great. I know the overall roadmap and updates have not be dramatic but I can say the stability and core functions have really improved. You should at least give it a shot.