Here's a description taken from the download page:
Windows Azure AD is the identity foundation for many Microsoft services like Office 365, Windows Intune, and others. Windows Azure AD is a comprehensive identity and access management cloud solution, utilizing the enterprise-grade quality and proven capabilities of Windows Server AD on-premises. It combines core directory services, advanced identity governance, security and application access management.
This series of whitepapers on Windows Azure AD offerings comprises:
- Active Directory from the on-premises to the cloud whitepaper.
- An overview of Windows Azure AD
- Leverage Multi-Factor Authentication with Windows Azure AD whitepaper.
- Leverage Multi-Factor Authentication Server on your premises whitepaper
- Leverage Windows Azure AD for modern Business Applications whitepaper.
There's also a zip file with some handy PoweShell scripts that complement the multi-factor authentication pieces.
Go get your hands on them all from here: