Mail can be copied from one profile to another by copying the mbox files, the large files with no extension, named after folders, found in Mail/<popserver>, Mail/Local Folders, ImapMail/<imapserver> and sbd subdirectories, to the Mail/Local Folders location of the target profile.

Thank you. I follow directions pretty. Unfortunately, there are some mitigating circumstances. Of the the four profiles showing, a couple of the older ones are POP Server accounts. I newer are IMAP. When I access the "Troubleshooting Information" section and open the "Profile Folder", the current profile is the "kvvmj0d.default-release". The other three are older and contain no useful information. Could I "simply" delete the other three profiles? Or should I ask, "how can I safely delete the other three profiles"? I actually think that would solve the problem. Thank you for your patience and continued assistance. Cheers, Phil

In the More Troubleshooting section, click about:profiles to delete the unwanted profiles. You'll be prompted to decide if the profile data should be removed. Before doing so, launch any of the non-default profiles and check if there are any address books or mail to be kept. Export address books to LDIF files and import them in the default, active profile.