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I'm using Thunderbird on Ubuntu 24 and have some messages in some mailboxes that have lost their headers. I'm trying to fix them.

Early (1980's command line mail & mailx) mbox files were pure text with messages delimited by a blank line followed by a line starting with 'From ' (or possibly 'From: '). When I open a Thunderbird mbox file in 'vi' it is 'converted', or so it says. I'm wondering what this 'conversion' is and why it's needed.

Please could someone tell me what the strict rule that delimits messages in a Thunderbird mbox file is, and what is it that 'vi' cannot handle that requires 'conversion'?

Thanks

153.3.1esr (64-bit) Thunderbird Meadow Thunderbird Snap for Ubuntuubuntu-snap-build - 1.0

I like using Threads, to keep repeated exchanges together.

Today, I selected one of my emails, then Edit as New, to edit and send some of the content to a couple others, independent of the thread.

but now, those emails to others are linked to the initial thread with the original recipient. I do not want them to be linked to that conversation thread, but instead for them to be in their own thread if a continuing email exchange occurs with these.

I do not want to remove them from history, but rather to merely break the existing link to the thread involving a totally unrelated recipient.