I'm trying to export a very large folder that has emails and many subfolders into a folder on the file system with the same structure and where all the emails are in .eml format. Or I'd like to export the messages in a way that they are easy to import in to Thunderbird. I can't seem to find a way except slowly drag and drop the email messages, while manually creating each folder, and that could take days to do, so I need a better method.