You are apparently attempting to copy a hierarchy from a mail store which has so-called "dual use" mailbox names (names that are both a mailbox and contain other mailboxes) to one which does not.
mailutil can not resolve the resulting conflict on its own. You have to give it some alternative name. In general, you can't create a subdirectory to INBOX, and you certainly can not create a subdirectory to a mail-file type mailbox. You have to use some other name. -- Mark -- http://staff.washington.edu/mrc Science does not emerge from voting, party politics, or public debate. Si vis pacem, para bellum.
