Click on the (white, empty) circle (the marked folder get highlighted
blue)
Enter the name of the new folder, select the parent-folder (select /
if none), click OK
Rename an existing folder
Select the specified folder, enter the new name, click OK
To delete a folder click "Delete" at the right of a foldername.
Folders are first moved to the trash. Deleting folders inside the
trash removes them completely.
Public folders are the same as normal folders, except they are
accessable (and writeable) by every user.
Deleting emails / folders inside the public folders moves them
to the public trash.
A public folder is automatically created for every user. (public
folders/$username)