Several months ago we added a feature to the Microsoft 365 Roadmap which generated a lot of interest. The feature was named Disable Basic Authentication in Exchange Online using Authentication Policies and as the roadmap items stated - it provided the capability for an Admin to define protocols which should allow Basic Authentication. Why was that so interesting? Well as you probably know, Basic authentication in Exchange Online accepts a username and a password for client access requests and blocking Basic authentication can help protect your Exchange Online organization from brute force or password spray attacks. Lately there has been an increase in the occurrence of these types of attacks, and so we are accelerating our release of this feature as it helps prevent them. If your organization has no legacy email clients or doesn’t want to allow legacy email clients, you can use these new authentication policies in Exchange Online to disable Basic authentication requests. This forces all client access requests to use modern authentication, which will stop these attacks from impacting your organization. We are still working on some aspects of this feature, and we’ll highlight those for you here, but in response to the increase of attacks we are seeing, we want to make authentication policies available to you now, and are therefore rolling this out worldwide immediately. There is already an excellent article describing how this feature works and we strongly suggest you read, understand and follow the article before enabling this feature. There are three important caveats to this feature:
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