Installing Office Communications Server 2007 R2 administrative tools on the same computer as Office Communications Server 2007 administrative tools or Live Communications Server 2005 with Service Pack 1 (SP1) administrative tools is not supported. Additionally, you cannot administer servers and users from previous versions of Office Communications Server or Microsoft Live Communications Server with the Office Communications Server 2007 R2 administrative tools, nor can you administer Office Communications Server 2007 R2 servers and users with previous versions of the Office Communications Server or Live Communications Server administrative tools.
You can use the Move Users Wizard in Office Communications
Server 2007 R2 to move users from Office Communications Server
2007. For details about migrating from Office Communications Server
2007 to Office Communications Server 2007 R2, see