Akeni Instant Messaging Server Pro

From Akeni:

Akeni Instant Messaging Pro is a client/server instant messaging platform that allows companies to host their own secured private IM system. The client has an user interface similar to AIM, ICQ, or MSN Messenger. It supports all the standard IM features such as chat, group conference, presence management, file transfer, offline messages and emergency alert/notification. Extra features include contact management and optional tabbed chat sessions. The server has advanced administration tools for managing user accounts, client-side logging capabilities and peer-to-peer file transfers. Akeni Pro Messenger can be setup on a private network without connecting to the internet and can easily be setup for use inside and outside the company firewall.