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Hello I've been seeing a strange issue with Thunderbird IMAP in combination with MSU Mail. Their Sent messages are split into folders by month, without the user doing anything. I can't find an option in Thunderbird or mail.msu.edu that would explain it, and this is happened to two people so far. One day all their Sent messages where in one folder, and the next day, they had moved into folders according to month underneath the Sent folder. Any ideas?