The first Thunderbird 115 beta is now available, so if you're already running beta, please update.

This Thunderbird Beta includes the first "Supernova" UI features, which provide an updated user interface, designed to be more modern, customizable, and with code that is easier to maintain and improve.

Release notes:

thunderbird.net/en-US/thunderb…

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If you have questions about #Thunderbird #Beta, or just want to share your experience with it, we encourage you to join our Beta support group: thunderbird.topicbox.com/group…

(We try to answer some questions here, but in our Beta discussion group you have access to the team, as well as a bunch of community experts)