And now my Email's gone. It appears the Inbox is corrupt; I've managed to import most of the other mailboxes into MacMail, but trying to get Inbox crashes MacMail. Rebooting Netscape -- it doesn't acknowledge it HAS the account at all.
So I guess I have to go and try to edit the Inbox file and see if I can find the part of it (hopefully the header) that's killing everything, or else I've lost about 1.2GB of mail from 5 years through yesterday. :(