For more information, see Basic authentication deprecation in Exchange Online.Īs part of the rollout, users will initially get a warning message if they try to access a file using Basic authentication. There is a separate effort to deprecate Basic authentication with Exchange Online. This change doesn’t affect Outlook connecting to Exchange Online using Basic authentication.This change doesn’t affect Outlook connecting to on-premises Exchange Server using Basic authentication.The message will include a link that takes users to an article that contains information about the security risks of Basic authentication. Instead, they'll see a message that the file has been blocked because it uses a sign-in method that may be unsecure. With this change, if users try to open files on servers that only use Basic authentication, they won't see any Basic authentication sign-in prompts. Therefore, to help improve security in Microsoft 365 Apps, we’re changing its default behavior to block sign-in prompts from Basic authentication. For example, modern authentication, which supports multifactor authentication, smart cards, and certificate-based authentication. The threats posed by it have only increased and there are better and more effective user authentication alternatives. These credentials are often stored on the servers, making it easier for attackers to capture them and reuse them against other endpoints or services.īasic authentication is an outdated industry standard and doesn't support more robust security features, such as multifactor authentication. The information in this article is related to Message center post MC454810, which was published in the Microsoft 365 admin center on Novemand updated on November 16, 2022.Īpps such as Word and Excel allow users to use Basic authentication to connect to resources on web servers by sending usernames and passwords with each request.
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