Microsoft Azure is making progress catching up to its competitors. While Office 365 is clearly a leader in cloud service offering Microsoft has many products in this space. One central theme centers around how to provision users for these services and simplify management. AD FS (Active Directory Federation Service) has been around since Windows 2003 R2 yet has remained a complex service to build into an organization.
Here comes Windows 2012 R2 and AD FS v3.0. Now AD FS can be installed as a simple role, even on a Domain Controller and doesn't rely on IIS.