Daiki Ueno <ueno@unixuser.org> writes:
> Presumably nnimap has a confusion of encodings used for IMAP mailbox
> names and Gnus group names.  The attached is a patch which converts the
> Gnus group name to the IMAP mailbox name, and back.

Sorry for consecutive posts.  The attached patch is more consistent and
robuster than the previous one.  It does explicitly encode non-ASCII
group names in UTF-8 (if available).

I've checked this version working with Emacs 22 & 23, and XEmacs 21.4 +
Mule-UCS.