Renaming top level/sub mailboxes

[Simon Matter]

>
> When I try to move a top level mailbox to be a sub mailbox, or vice
> versa, the IMAP server returns:
>
> "NO Operation is not supported on mailbox"
>
> eg.
>
> renm user.toplevel user.aa.toplevel
> renm user.aa.toplevel user.toplevel
>
> Why is this? Can I get around it other than creating a new mailbox and
> copying the messages over (which loses the \Seen state).

Is 'allowusermoves' enabled in imapd.conf?

Regards,
Simon