This article discusses why you must not rename or move the Exchange Administrative Group or the Exchange Routing Group after you install Microsoft Exchange Server 2007 in a mixed-mode environment.
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After you install Microsoft Exchange Server 2007 in a mixed-mode environment, you must not rename the Exchange Administrative Group or the Exchange Routing Group in Exchange Server 2007. This is because Exchange Server 2007 uses the Exchange Administrative Group for configuration data storage and uses the Exchange Routing Group to communicate with earlier versions of Exchange Server.
Additionally, the process of moving objects that are contained in the Exchange Administrative Group or in the Exchange Routing Group is not supported in Exchange Server 2007.
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