Something like:
Code:
/home/fouldsy/.mozilla-thunderbird/brofvc2v.default/Mail/
in my case. The "~/" means your home directory. A . before a folder or file means it's hidden, so it won't appear automatically whilst listing directories. So, look under /home/yourusername/.thunderbird and find a folder that looks like random letters + numbers - that's your profile folder. Within there, a mail folder will exist holding your e-mails.