Installed Fedora 20 from Fedora 18. fresh install. Moved old email Mail Folder from F18 .thunderbird and puts all of the contents fom old email into F20 .thunderbird. I can see from File Manager that the OLD Emails are in the .thunderbird/Mail folder, but How do I get Thunderbird to display those old emails ? I'm connected to my ISP and can download new Emails.