The general consensus in the Exchange community is that you do not rename a domain with Exchange installed. Even though Microsoft have provided instructions on renaming a domain, Exchange more often than not doesn't like it.
Therefore the only scenario I would even consider is a new forest.
Simon.
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by: ErikKvKPosted on 2007-02-07 at 01:00:48ID: 18483422
In short.
Scenario 1 is low risk, low effort and low cost. Renaming the domain should not affect Exchange, but is (in my humble opinion) not proven.
Scenario 2 is low risk, high effort and medium to high cost. But migrating between domains is e proven and tested method.
Only question which remains is: Do you really need to rename the domain?