Renaming top-level user mailboxes. Is it still impossible?

[Igor Zhbanov]

Hello!

(I use Cyrus IMAP v2.3.8)

I need to rename user a at example.com to b at example.com, so I issue
following command and see (a use slashes as separators):

192.168.0.9> renm user/a at example.com user/b at example.com
renamemailbox: Operation is not supported on mailbox

I have reed some pages about that. They suggest to create new mailbox
manually, then transfer all mail, then delete old mailbox. Is there
better solutions now? Patches?

Thanks.