Active Directory with Windows Server 2003 R2
Active Directory with Windows Server 2003 R2 includes Active Directory Federation Services.Active Directory Federation Services, or ADFS for short, is the new Microsoft Web services technology that allows for companies to pursue Web based transactions with business partners (Business to Business or B2B) securely. When working with other companies you sometimes need to allows clients to access resources in your domain, or vice versa. Because of the nature of the Internet, resource sharing can always be nerve racking - there is more security that needs to be implemented and that technology is called WS-Federation. Most times, making Web transactions can be deemed insecure, and if you need to maintain identity information for outside business partners and customers, ADFS is for you. Integrated tightly with Active Directory, ADFS helps to keep Web transactions secure. (continue at source)








