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Software Update Services 1.0 with Service Pack 1
M$Supported Operating Systems: Windows 2000, Windows Server 2003
Microsoft Software Update Services: Frequently Asked Questions
M$Q. Which client operating systems does SUS support?

A. The Automatic Updates component is supported on Windows 2000 Service Pack 2 (SP2) and later operating systems.

• If you are running Windows 2000 SP2 (either Professional or Server family) or Windows XP RTM, you will need to install the Automatic Updates component using the appropriate language-specific MSI file.

• If you are running Windows 2000 SP3 or later, Windows XP SP1 or later, or Windows Server 2003, the Automatic Updates component comes with the operating system, so there is no need to install the client MSI file.