From a Microsoft perspective, you could use the Microsoft Exchange Server Mailbox Merge Wizard (ExMerge) and the Active Directory Migration Tool (ADMT). There are also many third-party tools available to assist you in this inter-organizational move.
The only way to change the domain name is if you are running Windows and Exchange 2003. The following links will give you additional information on the process, but the information is not very user friendly:
- "Windows Server 2003 Active Directory domain rename tools"
- "Supplemental steps for using the Exchange Server Domain Rename Fixup tool together with the Windows Server 2003 domain rename tools"
Please look at both links -- one is the guide and the other is the supplemental information to make this process a success.
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