Question : How do you properly decommission an inactive Exchange 2007 Server?

We just stood up an new Exchange 2007 server in our network, one with greater capacity and performance. I've moved ALL services/stores/etc to the new server, and tested them. I've even powered the old server down to make sure that all services work properly. Of couse, I get communication errors in the Exchange Management Console when I do that, as it can't see the old server. I need to make sure that the old server isn't showing up in AD and that the Exchange Management Console doesn't point to it anymore. I'm at a loss on how to do this.
Both servers are running Exchange 2007 SP1 w/ Forefront Sp1.

Answer : How do you properly decommission an inactive Exchange 2007 Server?

have you removed the roles from the old server?
http://support.microsoft.com/kb/927464
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