Read the following quote very carefully (note that we don’t sell Dell or Small Business…)
* If you are running Windows Small Business Server 2003, please install using the instructions at, Windows Small Business Server 2003 Service Pack 1 web page.
* If you use a Dell Server with a Dell factory installed version of Windows Server 2003 as a domain controller, we recommend that you go to Dell web site for more information prior to installing Windows Server 2003 SP1. This issue only affects a limited set of users with specific disk drive controllers that are configured to be a domain controller.
* There are two issues with Windows Server 2003 Service Pack 1 which may affect server-to-server communication for TCP/IP and/or RPC traffic across firewall or VPN products in rare and specific network configurations. This can affect domain replication and other connectivity. When you deploy SP1 it is always a recommended practice to monitor domain controller replication to ensure that your Domain Controllers are not affected. For specific details including hotfix availability, please read knowledge base article 899148 and knowledge base article 898060