Rated 2 out of 5 stars

I have exported a structure of mailfolders and messages from Apple Mail.
The structure looks fine with proper folder names when exported.

I move the structure with a USB-drive to my Windows 10 PC and try to import the entire structure.

I am having no luck as only the top level folder gets imported. That folder is named "mbox###" and not the name of the top level folder.

Messages are fine in the imported folder but no sub-folders are imported.

This review is for a previous version of the add-on (4.0.4). 

William
Can you provide a few more details:
- ImportExportTools NG version
- Thunderbird version
- Export from Apple Mail options/file format
- Confirm you were using import (mbox?) With subfolders

I fixed several import issues in v4.0.3 & v4.0.4
during which I did a fair amount of testing

For issue debugging it's always helpful to use the repository issues
where we can do a proper back-and-forth.
https://github.com/thundernest/import-export-tools-ng/issues