This is one of those SBS 2003 subjects that causes a lot of confusion. Yes Windows 2003 domains can be renamed but can you rename a Windows Small Business Server 2003 domain?
A quick examination of the documentation and it should be possible get nearer doing it and you find NO it can’t.
The problem being that you cannot rename a domain if Exchange 2003 is installed on a Domain Controller. SBS 2003 is a DC with exchange 2003 installed so the rendom tool will not work.
If you are installing SBS and have not yet installed Exchange you can use the rendom tool.
Like many you installed SBS without fully understanding your requirements. It was installed using sbsdomain.local and your external domain is abcaccountants.co.uk and you want to unify the domain names.
You have found that a single domain third party certificate is much cheaper than a multi domain cert and you want to rename the SBS domain to abcaccountants.co.uk
Step1: Ensure Domain Level is Windows 2003
Raise the default domain functional level to windows 2003 in order to rename it. (See my post)
SBS 2003- Windows 2003 Change Domain & Forest Functional Levels
Step 2: Ensure Exchange 2003 at least SP1
Exchange 2003 must be at least service pack 1 and domain renaming is not possible if an Exchange 2000 server is in the domain
Step 3: Rename Your Windows 2003 Domain
Microsoft TechNet: What Is Domain Rename?
Microsoft TechNet: How Domain Rename Works
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