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Betterbird: A Thunderbird Fork That Promises Better Features
(news.itsfoss.com)
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As per the FAQ they seem to share the exact same profile so you can seamlessly switch between them (provided both are the same dot release)
I just gave it a try and it does not pick up my existing Thunderbird data automatically, or prompt to import it.
The instructions change if you're using flatpak. I was only able to get it to work with a manual import
I'm on Windows on this PC, so nothing being isolated here.