Internet Security and Acceleration (ISA) Server 2000 Service Pack 2 (SP2) provides the latest updates to ISA Server 2000 and provides an even higher level of security, reliability and stability to customers. Microsoft strongly encourages customers to install SP2 on all computers running ISA Server. ISA Server 2000 SP2 can be installed directly on ISA Server 2000, ISA Server 2000 Service Pack 1 or ISA Server 2000 Feature Pack 1 or any other combination of hot fixes.