This section of the settings task allows you to manage the tree of mailbox folders.
The hierarchical folder tree is displayed in the middle list widget where you can select a single folder by clicking it. Folder information and some settings then appear in the right properties pane.
There might be folders which are grayed out and which cannot be edited nor deleted or renamed. Such folders are “virtual” folders which are only there for structuring but which cannot contain any messages.
Some Special System Folders cannot be renamed or unsubscribed because they have special purposes and are used by system processes.