This article may be of help to some readers here:-
https://support.mozilla.org/en-US/kb/thunderbird-128-nebula-faq
The article answers questions for new users of Thunderbird 128 (Nebula),
in particular users who have upgraded from a previous version.
Nebula is constantly evolving. Throughout the next year, we will deliver
many improvements to existing Nebula features and introduce brand new
ones. Upgrade to version 128 and experience the future of Thunderbird!
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