Microsoft Corp. announced the release to manufacturing (RTM) of Microsoft® Office Live Communications Server 2005. Part of the Microsoft Office System, Live Communications Server 2005, available for the first time in both Standard and Enterprise Editions, enables organizations to extend the benefits of enterprise instant messaging and presence awareness to remote business partners, customers, co-workers and suppliers, empowering them to quickly find and communicate with each other and ultimately make better decisions more quickly.
http://www.microsoft.com/presspass/press/2004/oct04/10-26MSDeliversLCS2005PR.asp