PLAN FIRST: In Azure Active Directory (AAD) Admin Center use Sign-In Logs with "Client Application" filter applied to see what users or devices are still using Basic Authentication. In the Modern authentication flyout that appears, click to enable or disable Turn on modern authentication for Outlook 2013 for Windows and later (recommended). ![]() Microsoft has a thorough advisory link: Here is my summary: Using the Microsoft 365 admin center In the Microsoft 365 admin center, go to Settings > Org Settings > Modern Authentication. Don't wait until the last minute! Basic Authentication is putting your organization at risk today. Unprepared organizations will find their users cannot access email or other resources. ![]() OctoBasic Authentication (aka Legacy Authentication) will be deprecated in Exchange Online (Microsoft 365 platform).
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