I successfully made the changes in servers requested by AOL in November 2017 (I have the recommended POP3 settings). Worked fine until February 2018, when incoming messages, whether read or unread, would double under circumstances that seemed random. My T'bird incoming mailbox went from having maybe 5000 emails to now having 90,000 Today I tried to sort by correspondent so as to find one They did sort into correspondent alphabetically, but now the account seems completely frozen. I cannot do anything; cannot go to Account Settings. I wonder if I can delete the existing T'bird account, set up a new one (and maybe in a way that won't have the duplication problem), and then search the aol mail page when I need to see an old email. Thank you very much for reading this.