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11/28/25
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Comment on [#13985] Outlook 2013 clients showing duplicate emails
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> Hello, > When Outlook 2013 is first started and starts syncing, some new > emails are duplicated in the mailbox view. Mike's diagnosis: > It's related to the MOREAVAILABLE functionality. If you look at the > group of messages the first time the message is sent, you'll see that > it's the last 4 messages that are sent again in the following request > that says it is sending messages remaining from the previous sync. > For some reason, the state isn't being updated to reflect that it was > already sent, or for some reason the message UID is returned twice > from the IMAP server and we don't detect that.
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