Before you can set up Microsoft Internet Security and Acceleration (ISA) Server as an array member, the ISA Server schema must be installed to Active Directory. ISA Server includes an Enterprise Initialization utility that you can use to install the ISA Server schema in Active Directory. For details on how this impacts the Active Directory, see Active Directory.
After the ISA Server schema is imported, all subsequent ISA Server installations to computers in the domain can use the ISA Server schema. You do not have to install the schema again. For more information, see The enterprise and arrays and Initialize the enterprise.
In order to install the ISA Server schema to Active Directory, you must be an administrator on the local computer. In addition, you must be a member of the Enterprise Admins and Schema Admins groups. For more information on user and group permissions, see Active Directory in Windows 2000 Help.