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https://social.technet.microsoft.com/wiki/contents/articles/32211.modern-authentication-behavior-across-office-2013-and-office-2016.aspx
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| Enable Exchange Online for modern authentication |
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| Enable Exchange Online for modern authentication |
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| Enable Skype for Business Online for modern authentication |
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| Enable Skype for Business Online for modern authentication |
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Enhanced Clients
Those client applications that do not support modern authentication are called Enhanced Clients. You will not be able to protect Enhanced Clients with MFA, unfortunately.
In order to allow users to continue using Enhanced Client applications, you will need to bind an Enhanced Client logon procedure to the Office 365 application in your DualShield server. Thereafter, users using Enhanced Client applications will continue to be authenticated by their username and password only. Check the details in Logon Procedures for Office 365 MFA