A question I get asked every now and then that doesn't seem to be particularly well documented is whether SMS 2003 supports renaming of the domain or domain migration. While technically two different things, the short answer is no, we do not support changing the domain name that SMS 2003 is installed into.
Page 235 of the Scenarios and Procedures for Microsoft Systems Management Server 2003: Planning and Deployment doc says:
Caution: To change the domain name and the computer name after SMS is installed, you must remove your installation of SMS, change the names, and then reinstall SMS. To avoid this time-consuming task, consider this information carefully before you enter it.
For the long answer, see the notes below:
SMS client and SMS sever components pass only NetBIOS names to the operating system for resolution. SMS never uses fully qualified domain names. If a computer’s common name is the same as its NetBIOS name, and DNS is configured appropriately, you can manually resolve the common name to an IP address with the Net Use command. In this case, SMS will operate properly without WINS.
Hope this helps,
J.C. Hornbeck | Manageability Knowledge Engineer