renaming mailboxes

[seph]

I'd like to rename user.foo to xuser.foo, and I can't seem to do this
with cyrus 2.2.12, I do have allowusermoves set to yes. From cyradm:

   imap> cm user.foo
   imap> rename user.foo user.bar
   imap> rename user.bar xuser.bar
   renamemailbox: Operation is not supported on mailbox

Is there a cleaner way than using the filesystem and reconstruct?

seph
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