There is a good article available from Microsoft on changing this to another account, How to change the service...
account. As for binary domain controller vs. member server, some third-party companies provide utilities to demote binary domain controllers into member servers.
It really shouldn't matter if Exchange 5.5 is running on a binary domain controller or a member server -- unless you are trying to beat the end of life support coming shortly for NT.
Once you complete your Exchange 2003 migration, you will decommission the old Exchange 5.5 servers, and undoubtedly that would include your binary domain controller loaded as the underlying operating system.
Do you have comments on this Ask the Expert Q&A? Let us know.
Related information from SearchExchange.com:
Related Q&A from Peter terSteeg
If recently created mailboxes are not displayed in the GAL after a migration to Exchange 2007, Active Directory (AD) has yet to replicate the ...continue reading
If you are migrating mailboxes across domains after an upgrade to Exchange Server 2007, you will need to update the Exchange Management Console.continue reading
Items deleted before an Exchange Server migration will not carry over to the new server, even if a Deleted Items Retention period is set. Find out ...continue reading
Have a question for an expert?
Please add a title for your question
Get answers from a TechTarget expert on whatever's puzzling you.