I have had to reinstall Windows 7. I saved the email folder
\AppData\Roaming\Thunderbird\Profiles\yg3frwjm.default before doing so.
Now, how do I integrate the mails in this folder to newly created email accounts?
It's covered in this extensive FAQ on the mozillazine site.
Misread, so you have a new profile and want to copy the old stuff in? Same document, but different section, specific link.
Which eventually goes here.