Folder operations on *.eml files/attachments were activated until April 2009 (bug 489005), so they could be moved to a Thunderbird folder until then. But this introduced some errors in mail moving, etc. (bug 259522).
Workaround:
Save attached message to folder (outside Thunderbird) and import it with the addon "ImportExportTools".
Folder operations on *.eml files/attachments were activated until April 2009 (bug 489005), so they could be moved to a Thunderbird folder until then. But this introduced some errors in mail moving, etc. (bug 259522).
Workaround: ols".
Save attached message to folder (outside Thunderbird) and import it with the addon "ImportExportTo