When you enable modern authentication in Exchange Online, Windows-based Outlook clients that support modern authentication will be prompted to log in again. For more information, see What are security defaults?. However, if you've enabled security defaults in your organization, POP3 and IMAP4 are already disabled in Exchange Online. These other email clients always use modern authentication to log in to Exchange Online mailboxes.Įnabling or disabling modern authentication has no effect on IMAP or POP3 clients. Modern authentication is enabled by default in Exchange Online, Skype for Business Online, and SharePoint Online.įor tenants created before August 1, 2017, modern authentication is turned off by default for Exchange Online and Skype for Business Online.Įnabling or disabling modern authentication in Exchange Online as described in this topic only affects modern authentication connections by Windows-based Outlook clients that support modern authentication (Outlook 2013 or later).Įnabling or disabling modern authentication in Exchange Online as described in this topic does not affect other email clients that support modern authentication (for example, Outlook Mobile, Outlook for Mac 2016, and Exchange ActiveSync in iOS 11 or later).When you disable modern authentication in Exchange Online, Windows-based Outlook clients that support modern authentication use basic authentication to connect to Exchange Online mailboxes.

For more information, see How modern authentication works for Office client apps. When you enable modern authentication in Exchange Online, Windows-based Outlook clients that support modern authentication (Outlook 2013 or later) use modern authentication to connect to Exchange Online mailboxes. Modern authentication is based on the Active Directory Authentication Library (ADAL) and OAuth 2.0. Modern authentication in Exchange Online enables authentication features like multi-factor authentication (MFA), smart cards, certificate-based authentication (CBA), and third-party SAML identity providers. That are not yet there in new EAC at Other Features or use Global Search that will help you Other admin centers and remaining ones will soon be migrated to New EAC.

While most of the features have been migrated to new EAC, some have been migrated to Microsoft recommends using the new Exchange Admin Center, if not Effective from December 2022, the classic Exchange Admin Center will be deprecated for

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