Thunderbird is a free and open source email, newsfeed, chat, and calendaring client, that’s easy to set up and customize. Thunderbird 115 Supernova features an updated user interface, designed to be more modern, customizable, built for easier maintainance.

This is a significant update to a very old piece of software! I was surprised to discover it's still being maintained!

@chrismessina It was still working like a charm though, looking forward to try the update

The convenience and ease of use that Thunderbird provides make it an excellent choice for managing emails, newsfeeds, chats, and calendars. Wishing you great success with Thunderbird 115 Supernova!

i had been using and advocating Mozilla Thunderbird for 4 years. reason? it is fast. really fast. native code is native code. polymail, spark and other fancy JS tools will never compare to a Mac app built for Mac. however, i switched to the default Mail OSX app a few months ago. what i disliked in Mozilla Thunderbird: - the cache size was the main reason. it was 42 GB. - the templates management is poor. i used a plugin for that that used to break. - you can't change the interface language. if you have never used Thunderbird i definitely recommend trying it. it takes more time to set up, but after you are set, the flow is as fast as light.