Azure Active Directory (AD) is a key part of both Azure and Office 365, which uses the same directory. The directory service is free, but a premium version, now in general availability, adds multifactor authentication, security reports showing suspicious access, self-service password reset, and group-based application access. Azure AD can be integrated with on-premise AD, enabling single sign-on and simplifying user management.
More significant, Microsoft says Azure AD now supports 1,200 third-party SaaS apps, including Salesforce.com, Box, Citrix GoToMeeting, and even Google Apps. Azure AD Premium is also part of the Enterprise Mobility Suite announced in March, along with InTune for mobile device management and Azure Rights Management for protecting sensitive documents.