Microsoft Federation Extensions for Windows SharePoint Services 3.0 RC.


With this release, federate existing SharePoint deployments, including Windows SharePoint Services 3.0 and Microsoft Office SharePoint Services 2007. Using this package, enterprise SharePoint administrators can configure their deployments to trust any WS-Federation security token service (STS), such as Active Directory Federation Services 2.0, so that an enterprise can take advantage of claims and offer their services to federation partners.

Get more info go here