The document provides an overview of the Nortel Multimedia Communication Server (MCS) 5100, including descriptions of its key features and benefits for enterprises. The MCS 5100 is an application server that transforms enterprise communications by unifying voice, video, instant messaging, and other collaboration tools. It improves productivity and mobility while reducing costs. Some of its main features include audio and video conferencing, file sharing, whiteboarding, presence, and integration with soft clients for IBM Lotus Notes and Microsoft Outlook.