Server {2} is running Exchange 2000 Server, but the August 2004 Post-Service Pack 3 update rollup (Microsoft Knowledge Base ...

Server {2} is running Exchange 2000 Server, but the August 2004 Post-Service Pack 3 update rollup (Microsoft Knowledge Base article 870540) has not been applied. Install the rollup from http://go.microsoft.com/fwlink/?LinkId=33457 before Exchange Server 2007 is introduced into the topology. Otherwise the Exchange 2000 Server services may fail to start.