AD: Domain migration or renaming?
While there are tools that can rename a domain, it can be a complicated process. You have a couple options. 1. You can add an alternate UPN so that @domain.com is valid. 2. You can migrate to a new domain. I'd try the upn route first
Domain rename worked just fine using Microsoft's rendom.exe utility (I'd say it was easy, perhaps because there was no exchange server involved). Service logons were changed for SQL Services and everything worked smoothly.