We do not use MS Exchange at our office. We setup all email to use pop. Now several people want to use IMAP so they can have continuity between their smartphone and Outlook. I was wondering some things about IMAP settings. I see that you can set a slider for offline mail. Between 1 month to 24 months to all. What does this exactly do? If you set it to 6 months does all your email that you have saved in different folders disappear after this time period? Also when I go into more settings I also see an area that says: "Mark items for deletion but do not move them automatically" What does that mean? And last: "Purge items when switching folders while online." What is that? Thanks!