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As long as the Exchange 5.5 servers are built on machines that are just member servers, and not servicing a backup domain controller role in the old NT domain, I would simply add the machines into the new AD domain. Then, change the Exchange 5.5 service accounts and reassign all of the mailboxes in Exchange 5.5 with a a new Active Directory primary NT account.
This way the original Exchange 5.5 servers will exist as member servers in the new Active Directory domain; the service account for Exchange is an Active Directory object; and, lastly, the accounts used to log into the mailbox are the new Active Directory accounts.
This article might be helpful as well: How to change the service account password.
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