If necessary, you can use the Communicator Web Access snap-in to stop virtual servers.
To stop a virtual server
Log on to the computer that is running the Communicator Web Access snap-in. To stop a virtual server, you must log on as a member of the local Administrators group and the RTCUniversalServerAdmins group.
Click Start, point to Administrative Tools, and then click Microsoft Office Communications Server 2007 R2, Communicator Web Access.
In the console tree, expand the name of the computer that hosts the virtual server that you want to stop, right-click the name of the virtual server, and then click Stop.