Options | Preferences | System will tell you what your Mail Directory is. When you open your mail directory in Explorer, you should see a folder structure that resembles your account structure in The Bat.. so, I guess that is how the structure is saved.

When you know that there are folders in an account but you do not see them in The Bat's account tree panel, click on that account in the panel and press Ctrl-Alt-Shift-L. That should cause The Bat to re-scan the folders.

I also have the same question but the current answer does not satisfy the question where the source folder structure is IMAP and the target is POP.
With the recent update to The Bat that now permits POP via Microsoft exchange servers oauth, I have upgraded my The Bat revision from 10 to Rev 11.4 (I really don't like IMAP...)

I found an alternate solution to the problem that appears to work.
The sorting office.
I created a filter in the old IMAP account to simply copy (or move) all messages (including attachments) from the IMAP folder structure into the new POP account inbox. I then take the filters that I had for sorting messages in my IMAP structure into the POP filter account and modify the rules suit to the new POP account.  As my IMAP account database is around 50G including attachments the copy part has taken a while. My filters should be relatively easy to modify from there and restore the complete database into the POP structure required.


Andrew