Communicator also provides enhanced "presence" -- information on what someone is doing and whether he or she is available, or even whether they are out of the office -- and routes incoming communications based on a person's presence and personal preferences. These and other Communicator features are extended across Microsoft Office System applications, including Microsoft Office Outlook 2003, Microsoft Office SharePoint Portal Server 2003 and Microsoft Office Live Meeting. This allows people to quickly initiate communication and collaborate directly from familiar Microsoft Office applications. These integrated communications tools are also available to developers of third party applications.

Download:
Office Communicator 2005 Trial

News source: Microsoft PressPass