Here is the abstract of the paper itself:
Through its support for the WS-Federation and Security Assertion Markup Language (SAML) 2.0 protocols, Microsoft® Active Directory® Federation Services 2.0 (AD FS 2.0) provides claims-based, cross-domain, Web single sign-on (SSO) interoperability with non-Microsoft federation solutions. Shibboleth® 2, through its support for SAML 2.0, enables cross-domain, federated SSO between environments that are running Microsoft and Shibboleth 2 federation infrastructures. »
You can download the whitepaper in .docx format HERE.