Microsoft Office Communicator 2007 is Microsoft’s unified client enabling information workers to communicate in real-time using a wide range of modalities such as VOIP calls, audio/video/web conferencing sessions and instant messaging. Office Communicator 2007 and Office Communications Server 2007 integrate with a wide range of Microsoft Office applications and existing enterprise telephony infrastructure.

System Requirements:

Operating System: Windows Vista™ 32-bit (RTM) operating system, Microsoft Windows XP Professional with Service Pack 2, Windows 2000 Professional with Service Pack 4 (requires Microsoft® Windows Media® technologies player, version 9, and Microsoft® Windows® Installer, version 3.0 or later)
For connectivity, Microsoft Office Communications Server 2007 must be deployed in the environment.