I have an imap server (provider is LaPoste...) whose system folders are under INBOX/ (OUTBOX, JUNK, DRAFT, QUARANTAINE) instead of being at the root. I have multiple TB clients, but the main one stores every sent mail in a local "Sent" folder while other mobile clients (other TB or smartphone native) leave them online in the default system places INBOX/OUTBOX. On the main TB client, I have configured unified folders to look for imap's INBOX/OUTBOX and the local "Sent" folders. As expected, the "Sent" unified folder has a "Local Folder" subfolder which point to the local "Sent" folder but there is no other subfolder for that "LaPoste" account. Still, all INBOX/OUTBOX messages are directly under the root of the "Sent" unified folder. Then this is where it becomes very confusing: what is being displayed under the unified "Inbox" and the folder for that LaPoste account changes kind of randomly after a TB restarts and during its's runtime., with 2 main cases: 1- The unified "InBox/LaPoste" folder shows OUTBOX, DRAFT, QUARANTAINE subfolders. They are populated with what's expected there but in that case, the "LaPoste" folder in the unified view is missing. I confirm that in the unified InBox properties, OUTBOX, DRAFT and QUARANTAINE of LaPoste are **not** checked 2- The unified "InBox/LaPoste" folder has no subfolder and in that case there is a "LaPoste" root folder in unified view with underneath OUTBOX, DRAFT, QUARANTAINE. 3- The unified "InBox" folder has no subfolder "LaPoste" but the messages from that account are still visible in unified "InBox". Then there is in unified view a "LaPoste" subfolder that will contain "OUTBOX", but not "INBOX" I have **never** seen a "LaPoste" subfolder under the unified "Sent" folder. If I use any other provider (say outlook) with a root folder structure that has a "Sent" folder and I do exactly as above, then this works as expected: - Under the unified "Sent" there is an "<outlook_account>" folder where I can see the messages still in the imap boxes. There is also still the "Local Folder" subfolder that points to the local "Sent" folder where I can see messages sent from the main client. - The unified view for "<outlook_account>" displays all remaining folders that have not been "allocated" to a unified folder for that account. NB: I had opened another question that was around the same topic but with a poor description, so I closed it, sorry about that.