How to block legacy authentication in Azure AD Premium Conditional Access

[Update 5/25/2018] Per this forum post [here] it looks like blocking legacy authentication is now possible with Conditional Access!. Azure AD Premium’s Conditional Access feature requires Modern Authentication to function properly. This has led some to believe that legacy clients (ex: Outlook 2010 and older, or Activesync) can bypass Conditional Access Policies. Based on my … Continue reading How to block legacy authentication in Azure AD Premium Conditional Access