ISA Server 2006 Standard is the integrated edge security gateway that
helps protect your IT environment from Internet-based threats while providing
your users with fast and secure remote access to applications and data.
Licensing: Microsoft ISA Server is licensed in the processor licensing
model. Under this model, a license is required for each physical or virtual
processor accessed by an operating system environment running ISA Server. This
license does not require any device or user CALs.