Here is a new Whitepaper on entitled “Active Directory from on-premises to the cloud” - http://www.microsoft.com/en-us/download/details.aspx?id=36391
This is a great whitepaper if you want to learn more about Windows Azure AD. Additionally you will find out that Windows Azure AD is the AD solution that is used for Office 365. This whitepaper gives insightful information on:
- How AD Authentication actually works inside of Office 365.
- There is some great information in here that explains how once you get it set up, it can be utilized across Office 365 and Azure services.
- There is information in here that will shed light on how Office 365 is support non-AD directories. This is because you can sync your corporate LDPA directors up to Windows Azure AD and Office 365 will utilize it.