I am just getting started with the Mac. I have discovered some "oddities" in recovering Mail with IMAP mailboxes. I had lost some mailboxes. Unfortunately this had happened while I was reorganizing the mailbox structure. Consequently, the top-level mailbox names had all been changed. The method of navigating back in time provided by Time Machine did not allow me to directly find any backup sets. Specifically, since the mailbox was not there to start from, there was no way to "regress" it back. Fortunately I discovered that I could regress using the Trash mailbox. Without this method of back-tracking, I would have been SOL. Another anomaly seems to be that a mailbox with subfolders can sometimes be recovered in one operation. However, sometimes some of the sub-folders are not restored. 1. Would this "regress via Trash folders" be the standard procedure in such a case? If so, is it well-known? 2. Why do sub-folders sometimes get omitted from the restoration?