re : ''Hopefully, Mozilla has a back-up server and I can request my E-mail history'' There is no such thing as a Mozilla back-up server. Any backup of anything on your computer is your responsibility. Thunderbird is a program; an email client; which you download, install and run when required. TB accesses server and either downloads emails or shows a remote view of folders on server. If you had an imap mail account then emails should still be on the server. So creating a new imap mail account would connect to server emails. If you had pop mail account then all emails are downoaded from Inbox and deleted off the server unless you changed Account Settings to keep messages on server. If emails are on server, then a new pop mail account would download them again. If the "Geek Squad" performed any backup then they should have included folders contained in the 'AppData' folder (assuming Windows OS), but often they aren't that techie or do not perform any backup unless specifically asked. Do you see a 'windows.old' folder on the desktop? If yes, then it is possible it contains the 'Appdata' folder which may have a 'Thunderbird' folder containing profiles. You may need to make hidden files and folders visible to see them. http://kb.mozillazine.org/Show_hidden_files_and_folders