EXPERT RESPONSE
This doesn't sound like a good scenario. For starters, in future make sure you have two domain controllers and a good backup. (I expect you figured that out already.) But it's a little late for that here, so these are the steps I suggest you take:
- Confirm that you have the exact name (case sensitive) of the organization and site in which this server was located, from an Exchange 5.5 perspective.
- Make sure you have the Exchange Server database in a safe location where it won't be overwritten, and then install Exchange 5.5 into the new domain that you created using exactly the same organization and site names you used originally.
- Now swap in the original database files and start the Exchange Server information store.
- Finally, run the DS/IS consistency adjuster once the service is running to create Exchange Server directory entries for all the directory entries found in the old store..
Do you have comments on this Ask the Expert Q&A? Let us know.
Related information from SearchExchange.com:
Tip: Top 10 database mounting problems -- and how to fix them
Expert Advice: Move Exchange 5.5/NT4 PDC to a server in a different domain
Learning Guide: Exchange Server migration
Reference Center: Exchange Server deployment and migration advice
Reference Center: Exchange 5.5 tips and resources
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