Internet Acceleration and Security (ISA) Server 2006 builds on the previous version of ISA Server as well as Microsoft Windows Server technology to provide a robust, effective, and easy-to-use firewall. Two versions of ISA Server 2006 are available: Standard Edition and Enterprise Edition.
The following table compares and contrasts the features of the two editions.
| Feature | Standard Edition | Enterprise Edition |
| Scalability | ||
Networks | Unlimited |
Unlimited |
Scale up | Up to 4 CPUs, 2-gigabyte (GB) RAM | Unlimited (per operating system) |
Scale out | Single server | Up to 32 nodes through Network Load Balancing (NLB) |
Caching | Single server store | Unlimited (through Cache Array Routing Protocol [CARP]) |
| Availability | ||
Windows Network Load Balancing (NLB) support | Not supported | Yes (integrated) |
| Manageability | ||
Policies | Local | Array and enterprise policies use Active Directory Application Mode (ADAM) |
Branch office | Through the manual import and export of policy | Enterprise-level and array-level policies |
Monitoring/alerting |
Single-server monitoring console |
Multiserver monitoring console |
Multiple networks | Templates | Templates |