Richard chats with Venkat Kalyanasundaram and David Apolinar about Azure Active Directory. The conversation starts out with a focus on the whole idea of claims-based security and what it takes to make single sign on work, especially with heterogeneous clients (like mobile phones and tablets) and cloud-based applications. David digs into the use and limitations of Active Directory Federation Services (ADFS) letting you keep your AD infrastructure in-house and your cloud-based applications authenticating against it. What happens when you want to scale further? Azure AD opens the door not only to high-scaling authentication infrastructure, but also support for a larger diversity of devices and applications. There are thousands of cloud-based applications supported by Azure Active Directory! Azure AD also opens the door to support for multi-factor authentication and other features to keep identities more secure and resistant to hacking. Check it out!