Let’s start of with a clarification: As of today, federating Office 365 (Azure AD) with a Custom STS is NOT supported by Microsoft.  Today the only supported STSs are AD FS 2.0, Shibboleth 2, Optimal IDM Federation Services and PingFederate 6.10. With that cleared, Office 365 STS supports both WS-Federation & SAML protocols for user [...]
Blog Post by: zamd