Discovered no mail download ( auto or manual) into tbird fm Jan1st, ( 146 updated mid Dec) As others already reported eventually determined due some interaction with email virus checker (AVG) HoweverTbird not useful or helpful in providing to user any indication of problem or providing failure info. Issue showed as 'Get email' not doing/showing anything - not showing pop3 login+download steps or anything else.. - saw one timeout popup wdw but usually nothing.. Error console showed an error message that "pop3 socket closed will not send info".... fine sfaigoes but have to go look for it. Downgrade tbird version (145) even tho 146 working for 2 weeks before stopped) - same issue/problem (as per error log) Direct access to server showed server end closing socket due multiple concurrent sockets open, indicating tbird and AVG.. reset AVG and reboot and restart and (145) now loading but.... Issue is that tbird should be presenting some failure indication to the user on socket connection failure ( wdw popup or message line status - where shows 'making connection";, "login, ...It doesnt show anything... so silent failure.... Just doesnt work ... Unrelated but should also mention that error console display of 146 prior to above 'pop socket close' msg also shows failure of verification of a tbird extn due missing manifest file... There was only one extn in the extensions dir so Its that one (supplied with 146 installation) - clearly named with a random collection of alphanumeric and hyphen chars... Cheers