You should synchronize the state of modern authentication in Exchange Online with Skype for Business Online to prevent multiple log in prompts in Skype for Business clients. See the Outlook and Basic Auth section of the Basic Auth and Exchange Online blog post for details.
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Further, the Basic Auth login dialog box and the Modern Auth dialog box look very different. 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.
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For 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).