We are getting ready to change the name of our company and I am trying to prepare for the change. We currently have one domain, yyy.com, which is at the Windows 2003 functional level. We also have one Exchange 2003 server that services all of the users in the yyy.com domain.
I need to create a new domain zzz.com in preparation for the name change. I'll be using a W2K8 Server as a domain controller, leaving it at the 2003 functional level. The trust between the yyy.com and zzz.com will be two-way transitive. I envision that eventually the yyy.com domain will go away.
Is it better to create another domain tree in the existing forest or create a new domain in a new forest? I've read that both are possible in this scenario. What happens if/when I need to delete the yyy.com domain since it is the Forest root domain (I believe)?
I do not need to create a new administrative boundary as I will be administering both domains. It is imperative that the existing Exchange server be able to handle email for both domains.
Your experience and expertise in this matter is greatly appreciated.