email inbox subfolders

I like the capability of filtering messages to put them in separate
subfolders in the Inbox of a mail address.

I would like a couple subfolders such as Mgmt & Admin under the Inbox
for one email address for one client. Over a year ago in Mozilla,
this worked fine but ever since I used SeaMonkey for a while and am
now back to Mozilla (1.7.13), I have problems with subfolder names - I
can't delete some or add one that I had deleted earlier.

I can do a little when in Tools | Message Filters when in Mail &
Newsgroups.

I did some cleanup in Windows | Application Data | Mozilla and the
mail folders inside my profiles but that was not enough, some old
subfolder names still exist somewhere.

I looked in about:config but found nothing.

I'd hate to think I need to edit the Windows (98se) Registry! (I
have run a Registry Cleaner and rebooted - a number times. No help).

Any suggestions were I could find and cleanup old subfolder names?


--
JohnW-Mpls

JohnW