The importexport addon does this easily and offers several options on format.

Thank you for your reply. When I go into import/export under tools, it brings up the profile. Under mail it opens local folders, but these are only unsent messages and trash, not storage local folders I have created. Then it gives a choice of apps to open for example, unsent mail, but none of them work or they bring up stuff I can't understand! Regards - John

First, highlight the folder you want to export. Then, click the importexport item. That menu gives several options. I did not say use tools>export. I referred to the importexport addon. That's the one to use.

Thank you for your help. Sorry, I just can't make it work, I'll try and find somebody local. Best wishes - John

How do I save local folders to s USB stick?

Help/More Troubleshooting, Profile Folder, Open Folder (Open Directory), close TB, open the Mail folder and copy the Local Folders subfolder to the USB drive.

Thanks, this deems to work. I could see all the local folders. Regards John