View Thunderbird databases and EML files and attachments, save and print them, with Mail Viewer
Mail Viewer is a free program you can use to read eMail databases and EML files, Thunderbird and Windows mail.
You can use this little tool if you removed a database from the mail folder and you can’t open it.
Mail Viewer works with standalone files. It displays a list of contained messages and their headers.
A message can be displayed in detailed view, including attachments (you can save) and HTML preview / printing. Messages can be saved to *.eml files.