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.