Received a certificate error in Eudora in Sept. 2015. I found a very helpful Verizon tech support that fixed the problem. Received the same type of certificate error several weeks ago. Decided to change to Thunderbird, since Eudora is no longer supported. I took the POP and SMTP address information out of Eudora, but I can still review my emails. I created several special mailboxes within Eudora. Can I import these mailboxes and their contents to Thunderbird ? Also, I see there is an archive capability in Thunderbird. Can I move my Inbox and sent messages from Eudora to Thunderbird under ' archive ' ? Can I have ' sub ' mailboxes within the archive file ?