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K-9 Mail is now Thunderbird
(blog.thunderbird.net)
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So is this sync functionality already available? (Edit: Citation corrected)
I'm not seeing it in my just-upgraded "Thunderbird Beta for Testers".
Not yet. Anyway OP shouldn't have posted an article from 2022.
Its been in testing for a bit. It got bumped from the last major desktop Thunderbird release and since Thunderbird releases used to be synced to firefox ESR releases its been a slow turnaround to get their schedule moving faster.