<< In Windows 2000 I know you can use a limited version of IIS 5.0. Go to Control panel, Add/Remove Programs, Select "Add/Remove Windows Components" and check Internet Information Service (IIS). >>
FYI, it's IIS 5.1, not 5.0. Not that it really matters. IIS 6.0 will ship with Windows .NET Server and it will surely kick some serious arse.