"My email connects, but I cannot download all of the messages. Sometimes duplicate messages are downloaded."

The most likely cause of this problem is at least one very large message in your inbox. On a dial-up connection, you may experience time-outs because of this. The reason that you may be seeing duplicate messages is because the server does not delete new messages until they are all downloaded. Since the large message will not download, it will resend all new messages each time the mail is checked. The solution to this problem is to login to your email via the web (instructions are here). Once you are in, you can view the message that is causing the problem, and delete it.