One of the changes in Office Communications Server 2007 R2 is that the administrative tools are not automatically installed on every server. You will need to plan which servers and workstations on which to install the administrative tools. Later in the migration you will need these migration tools to configure your new system and move users.

In general, you must use the administrative snap-in that corresponds to the server version that you want to manage. The only exception is that you use the Office Communications Server 2007 R2 snap-in to move users from Office Communications Server 2007 to Office Communications Server 2007 R2.

You can also use Active Directory Users and Computers on Office Communications Server 2007 or on a computer with the Office Communications Server 2007 snap-in installed.

Note:
The Office Communications Server 2007 administrative snap-in and the Office Communications Server 2007 R2 administrative snap-in cannot be installed on the same computer.