When it comes to finding the best Thunderbird Converter, I think the
FixVare Thunderbird Converter is the best choice.
I've used other tools before, but this one stands out because: -
It convert Thunderbird emails without losing any info.
It can export files in many forms, such as PST, MBOX, EML, MSG, and more.
The design is very easy to use, even for first-timers.
It doesn't change the layout of folders or the formatting of emails.
It works well with big Thunderbird accounts.