Optimize the language with OC
The language with OC is not optimize, when you install the OC in English version some folders are still in French (the server is in French), it's a real problem for the final users which understand not the french and it's even more disturbing in World Client.
XLIST support has been added to the IMAP server in MDaemon.
Emanuele Aliberti commented
Perhaps that could be achieved by making MDaemon IMAP server support XLIST and OC query MDaemon using XLIST.
Google, Apple and Thunderbird use XLIST. See for instance bug #495059: