This instant messaging is corporate oriented (enterprise), with local networks (LAN) or internet for effective intra-office communication. Server is PHP/MySQL (opensource), make easy for the administrator to choise all options, for display, contact manage, lock... Possible to force or not user to use password, limit (or not) maximum simultaneous users, online users, contacts numbers, allow smiley or not... IntraMessenger is autonomous, but authentication (login + password) possible by from another existing database (phpBB, vBulletin, Phorum, Joomla, PHPNuke, dotProject, eGroupWare, Ovidentia, SMF, TaskFreak...) Can display local time zone, country flag, and using language. Client compatible Windows (and Linux with Wine).