Fixed Issue #3830 mdbox format not working in mailboxes.

Till Brehm

2016-04-20 ef6e5d764118bcc2918be9cfd7b76c31b24a1eb4

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ALTER TABLE  `sys_session` CHANGE  `session_id`  `session_id` VARCHAR( 64 ) CHARACTER SET latin1 COLLATE latin1_swedish_ci NOT NULL;