The Unified account is normally automatically enabled when multiple accounts are present. You can toggle the feature on/off from: Settings > General Settings > Display > Show Unified Inbox. Once enabled, the Unified account is displayed at the top of the account list. # Press the top left menu button or swipe right on the message list. # Tap the down/up arrow (top left of screen) to toggle between the account list and account folder view. If you have custom imap folder and wish it's content to display in the Unified Inbox ... # Press the top left menu button. # Select an account with it's folder list visible (inbox, draft etc). # Tap manage folders (bottom of list). # Tap a folders name. # Toggle "Unify" ON.