launched Microsoft Internet Security and Acceleration Server 2000 (ISA Server 2000). ISA Server 2000 introduced the Standard and Enterprise editions, with Enterprise-grade functionality such as High-Availability Clustering not included in the Standard Edition. ISA Server 2000 required Windows 2000 (any edition), and will also run on Windows Server 2003. In accordance with Microsoft's Support Lifecycle Policy, ISA Server 2000 was the first ISA Server product to use the 10-year support lifecycle with 5 years of Mainstream support and five years of Extended support. ISA Server 2000 reached End of Life on 12 April 2011. ISA Server 2004 Microsoft Internet Security and Acceleration Server 2004 (ISA Server 2004) was released on 8 September 2004. ISA Server 2004 introduced multi-networking support, integrated virtual private networking configuration, extensible user and authentication models, application layer firewall support, Active Directory integration, SecureNAT, and improved reporting and management features. The rules based configuration was also considerably simplified over ISA Server 2000 version. ISA Server 2004 Enterprise Edition included array support, integrated Network Load Balancing (NLB), and Cache Array Routing Protocol (CARP). One of the core capabilities of ISA Server 2004, dubbed Secure Server Publishing, was its ability to securely expose their internal servers to Internet. For example, some organizations use ISA Server 2004 to publish their Microsoft Exchange Server services such as Outlook Web Access (OWA), Outlook Mobile Access (OMA) or ActiveSync. Using the Forms-based Authentication (FBA) authentication type, ISA Server can be used to pre-authenticate web clients so that traffic from unauthenticated clients to published servers is not allowed. ISA Server 2004 is available in two editions, Standard and Enterprise. Enterprise Edition contains features enabling policies to be configured on an array level, rather than on individual ISA Servers, and load-balancing across multiple ISA Servers. Each edition of ISA Server is licensed per processor. (The version included in Windows Small Business Server 2000/2003 Premium includes licensing for 2 processors.) ISA Server 2004 runs on Windows Server 2003 Standard or Enterprise Edition. Appliance hardware containing Windows Server 2003 Appliance Edition and ISA Server Standard Edition is available from a variety of Microsoft Partners. ISA Server 2006 Microsoft Internet Security and Acceleration Server 2006 (ISA Server 2006) was released on 17 October 2006. It is an updated version of ISA Server 2004, and retains all features from ISA Server 2004 except Message Screener. ISA Server 2006 introduced new features including: Support for Exchange Server 2007 (referred to