NOTE : %BRAND_AZURE_ACTIVE_DIRECTORY% pass-through authentication is currently in preview and is supported via web browser-based ...

NOTE: %BRAND_AZURE_ACTIVE_DIRECTORY% pass-through authentication is currently in preview and is supported via web browser-based clients and Office clients that support modern authentication. For clients that are not supported, such as legacy Office clients and %BRAND_EXCHANGE_ONLINE_SHORT% ActiveSync (i.e. native email clients on mobile devices), customers are encouraged to use the modern authentication equivalent. This not only allows pass-through authentication, but also allows for conditional access to be applied, such as multi-factor authentication.