As I posted earlier today, Microsoft enabled multi-factor authentication (MFA) for end users in Office 365. In addition, Microsoft enabled MFA for Azure Administrators. To further complicate things, there’s Windows Azure Multi-Factor Authentication, which provides advanced MFA features for Office 365 and Azure subscriptions.
Both MFA for Office 365 and MFA for Azure Admininstrators are included at no additional charge in Office 365 and Azure subscriptions. However, they offer a subset of features found in Windows Azure Multi-Factor Authentication.
The following chart, from the Active Directory Team Blog, provides a feature comparison for easy reference.
More details on Windows Azure Multi-Factor Authentication can be found here.
The post from the Active Directory Team blog that gets into more detail on MFA for Office 365 and MFA Azure can be found here.