I've noticed that there's little easy-to-find information on how to properly manage IMAP mail folders. Since I'm suddenly experiencing a lot of weird issues, like Mail suddenly storing sent e-mails in an unexpected folder, plus duplicate, confusingly named folders, etc., I thought I would create a master "How To Organize IMAP Folders with Mail/iPhone" thread, which I'm sure will be very useful for the legions of Mail and iPhone users. But first I have to show you my folder structure. I have four e-mail accounts that I have all set up under IMAP. Three are work-related and one is my MobileMe account, which I use to synchronize my calender and contacts. Inbox --MobileMe Account --Work 1 --Work 2 --Work 3 Sent --MobileMe Account --Work 1 --Work 2 --Work 3 Trash --MobileMe Account --Work 1 --Work 2 --Work 3 Junk --MobileMe Account --Work 1 --Work 2 --Work 3 On My Mac ~Sent Items (my PC e-mail pre-dating using Mail) --Admin ~to --Sales etc. (these folders are used to locally archive mail) Ubercool (IMAP server folders) --Apple Mail To Do --Deleted Messages --Drafts --Drafts (Ubercool) --Read --Sent --Sent Messages --Spam --Trash MobileMe (IMAP server folders) --Drafts The first problem I noticed is that suddenly, Mail started storing sent messages in the "Sent Messages" folder on the Ubercool server, but just as suddenly stopped. How do I prevent this from happening? Can I just move messages in the "Sent Messages" folder back to the main "Sent" folder? I assume this has something to do with the way the iPhone interacts with Mail and the way everything is synchronized, which brings up a separate problem of multiple Calendars showing on my iPhone: iPhone Default Calendar Setting On My iPhone Calendar email@example.com (MobileMe) Calendar (set as default) Can you post your tips on how to properly manage IMAP folders here and what your tactics are for properly synching your calendar? I would like to unify sent e-mails and eliminate duplicate Drafts and Drafts (Ubercool) folders, while avoiding duplicate calendar entries.