We are in the process of migrating from Exchange 5.5 to Exchange Server 2003. We are part of a large public organization, but for security reasons, need to separate from a forest the "main" IT department is creating and maintain our own forest. While trying to migrate our environment via the Connection Agreement Wizard in ADC Tools, we were getting the following error message. Again, for security reasons, we have removed the original organization names and placed dummy entries: Error: The organization o=YYY is already installed into this forest but the configured 5.5 server is a member of organization o=XXX. Please choose a 5.5 server in the correct Org. In the 5.5 environment, we were a container within organization XXX. Now, we put together Windows Server 2003 forest YYY and would like to migrate the contents of XXX onto YYY. There are some constraints. First of all, because we are actively migrating users and computers from our old Windows NT 4.0 domain onto YYY, changing the name of the new domain is not an option. Also, if possible, because of the complexity of the hardware our Exchange 2003 installation is residing on, we would prefer not to uninstall and reinstall Exchange 2003. Searching through Microsoft support has not yielded useful information. The closest to useful advice I obtained from Microsoft alluded to destroying and rebuilding Exchange, as discussed in http://support.microsoft.com/?kbid=273478, but I personally think there has to be a better way (a registry hack, for instance?). Any suggestions you can provide will be VERY MUCH appreciated.

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