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). We are running Cyrus 2.3.13. Regards, Dave. David Mayo Networks/Systems Administrator University of Bath Computing Services, UK ---- Cyrus Home Page: http://www.cyrusimap.org/ List Archives/Info: http://lists.andrew.cmu.edu/pipermail/info-cyrus/