I don't believe this is true, Anne. On another computer where I use TB! for a different account no matter how many times I check the mail (account is set to "Leave Messages on Server") each message is only retrieved once. Also, if what you say were true, on the shared scenario, we would have multiple copies of the same message appearing in the Inbox instead of exactly two since both computers are set to check for mail every 10 minutes. We do have both computers set to "Leave Messages On Server" but, like I said, in another standalone TB! installation the duplicate-message problem does not happen even with this setting. It must be something else causing the duplicate messages.