RESOLUTION: Un-check "leave messages on the server" and then "Send and receive" to get the mailbox cleaned out. If the list of downloaded message IDs becomes corrupted, which is common especially when that list gets long, Outlook will "lose track" and start downloading all messages over and over again. When it checks for new messages, it gets a list of all the message IDs on the server, compares it to the list or message IDs it has downloaded, and requests the messages it does not have. In order to remember which messages it has downloaded, Outlook keeps a list of the "message IDs" for the messages it has downloaded. Each instance of Outlook on each machine must "remember" what it has already downloaded. If the server remembered which messages had been downloaded, then they would not download again to another machine. The server does not "remember" which message you downloaded, which is why you can download messages at the office, leave them on the server and download them again at home.
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