Hi, I have an IMAP account through my ISP (Bigpond - Telstra) on: https://snt152.mail.live.com I have it configured with POP enabled, and it will allow clients to deleted messages. I have a POP account set up on a Thunderbird client on (OS X) to "Automatically download new messages". "Fetch headers only" is not checked. "Leave messages on server" is not checked. About half the time (or more) when the Thunderbird client downloads a group of messages it will download them again (and again (and again ...)). These are identical downloads. I saved the message source (Command-U, select all, paste into text document, save that) and compared them. They are identical down to the last byte. But it doesn't happen every time. If I login to through the browser and watch the Inbox and the Deleted folder I can see that messages that are downloaded extra times haven't been Deleted yet. Once a message moves from the Inbox to the Deleted folder (on the mail.live.com server) then Thunderbird doesn't download it again. The most recently downloaded messages in my Thunderbird Inbox have been downloaded 1, 2, 1, 2, 1, 3, 3, 1, 3 times. If there's a block of 5 to 10 (or more messages) that have been downloaded at the same time and if it repeats, it will repeat all of them. I have tried all solutions I've been able to find on the web. Is there a solution that I've missed? If I create a new gmail account can Thunderbird be configured to treat it as a POP account? Thanks, David