I use IMAP to access my school Exchange account. They make use of public folders that everyone can see, and there are about 800,000 items in said public folders. And Mail seems to try to download all of those messages, and it displays them as all unread. I don't care about those public folders. I used Thunderbird, and I could choose to unsubscribe from it and never see it, but I don't seem to have that option in Mail which I want to switch to. Am I missing something? Thanks