Rated 1 out of 5 stars

Installed "ImportExportTools" extension as instructed, but the "Import mbox file" option is grey i.e. not usable under menu "Tools/ImportExportTools".
Can anyone please tell me any other alternative to import mbox file? Thank you very much!

This review is for a previous version of the add-on (3.2.4.1). 

As it's written above,

"Note: if you want to import messages or MBOX files, you must first select a valid folder as a target, otherwise the import options are disabled"

Select "Local Folders" and the option will be active