I couldn't find this problem on this site since 646990 in 2002! I was using 0.8.6 when the problem started. In Outlook Express and WinXPsp2, it will go through the motions of downloading, but get the following error for each message.
Message number 1 could not be retrieved. Account: 'wxtomb', Server: 'localhost', Protocol: POP3, Server Response: '-ERR message 1 could not be downloaded', Port: 110, Secure(SSL): No, Server Error: 0x800CCC90, Error Number: 0x800420CD
I upgraded to 0.8.8 and got the same results. Any idea why this suddenly started happening? It had been working very dependably for many months now.