![]() The full details of the supported clients can be found here and to enable it here Enable modern authentication Exchange OnlineĮnabling it for Exchange is very simple, just run the command “Set-OrganizationConfig -OAuth2ClientProfileEnabled:$true” when you are connected to Exchange Online in PowerShell. This means that if Outlook 2013 is not configured to use modern authentication, it loses the ability to connect. Important Basic authentication is turned off for Exchange Online mailboxes on Microsoft 365. You don't need to set these registry keys for later versions of Office. Office 2013 does support it, but here you need to add a certain registry key to trigger the modern authentication, otherwise it will use basic authentication. Modern authentication is already enabled in Office 2016 or later. Off course the latest version of Office Pro Plus and Office 2016 support modern authentication out of the box. What clients support modern authentication So the question should be why not enable modern authentication? The answer to this is that modern authentication has a fallback to the classic authentication if the client does not support modern authentication. ![]() This is a fair question when you are working with older versions of Office because they do not support modern authentication, but when you have an office version that does not support modern authentication, you also almost out of support for the combination of Office client and Office 365. ![]() The modern authentication uses the ADAL (Active Directory Authentication Library). The benefits of the browser window is that you can have thing like multi factor authentication and smart card authentication. This browser windows allows you to have a certain flow of authentication that is not possible with the old dialog window. We are trying to enable modern authentication for our O365 Tenant, but the second login, the user have to retype the password on Outlook or they have to click the button 'Fix me' in Microsoft Word to access the work email account again. Modern authentication is basically a browser window where you can authenticate instead of the old username/password dialog. While writing this about 95% of the tenants are older then 1 month so modern authentication is not enabled for Exchange and Skype for Business. It is enabled for SharePoint online, not for Exchange and Skype for Business if your tenant is created before august 1st 2017. The first thing that might come to your mind might be that modern authentication is enabled for Office 365.
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