WSS and SPS 2003 Support boundaries for ADFS

From MS KB: Active Directory Federation Services (ADFS) enables web single sign-on, federated identity and access management by securely sharing digital identity and entitlement rights across security and enterprise boundaries. The ADFS functionality becomes available in Windows Server 2003 R2.SharePoint and ADFS integration is dependent on the ADFS ability to seamlessly convert the ADFS authentication … Read more