I am not understanding. Here is a suggestion: # copy the backed up profile to c:\users\<yourid>\appdata\roaming\thunderbird\profiles # click help>troubleshootinginformation and scroll down to 'profiles' in left side and click 'about:profiles' # your profile should appear and you can launch from there. BUT if it does not appear then do this: #* click 'create profile' button in upper left of screen #* then, click next #* then, enter short name for proflie, such as MYPROFILE, click the 'choose' button to locate and select the profile, click finish and launch At this point, you should be using the new profile. Since the accounts don't work, click 'account settings' and update each as necessary for the new names. Don't forget the SMTP servers also.