Personal folders are the user defined folders you add. You create and name folders for the personal organization of mail messages up to a system defined limit. Personal folders can be added, renamed, removed, and emptied. You can add these folders at the top, or parent, level or as sub-folders. Sub-folders can be added to sub-folders.
Personal folders appear below the system folder list (Inbox, Sent Items, Drafts, Spam, and Trash) with a small spacing separating the system folders from the personal folders. Sub-folders added to system folders appear below their parent in the System Folders list.