We have tried shutting down the BES and then the Exchange server, but when the BES starts back up, it starts the Exchange information store again. The BES MAPI profile, however, is pointing to the new Exchange server. Do you know why the BES insists on using this old Exchange information store?
It would also be best to build a completely new domain controller, transfer all operations master roles to it and then demote the old domain controller. When doing so, make sure that you've followed the instructions to uninstall Exchange Server 2003 from the existing server. Since you shouldn't have installed your BES on the same server as Exchange, you may find yourself needing to call into BlackBerry technical support for troubleshooting help.
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