[imp] How to add two new Special folders?

[Federico Giannici]

I'd like to show two new folders ("Virus" and "Black List") in the FIRST 
group of folders in the folders-list on the left pane (that is the group 
where are the "special" folders: Inbox, Trash, Sent, etc.). So that they 
will no longer appear in the second list of folders (the "user" folders).

Is there a way to accomplish this?

Thanks.