MailCore/mailcore2 — pull request #1024 by bnmaa (2014-12-30 08:03:26+00:00)
Title: use charset "IMAP-mailbox-name" instead of "mutf-7" when opening icu con...

ucnv_open("mutf-7", &err) always fails and returns NULL,
we should use "IMAP-mailbox-name" to open the UConverter