Microsoft 365 Basic Auth on Secure Techieshttps://securetechie.com/tags/microsoft-365-basic-auth/Recent content in Microsoft 365 Basic Auth on Secure TechiesHugoen-usTue, 15 Sep 2026 00:00:00 -0700Disable Legacy Authentication in Microsoft 365https://securetechie.com/blog/disable-legacy-authentication-microsoft-365/Tue, 15 Sep 2026 00:00:00 -0700https://securetechie.com/blog/disable-legacy-authentication-microsoft-365/<p>Here&rsquo;s the short version: <strong>disable legacy authentication in Microsoft 365 or MFA is still optional for anything that speaks basic auth.</strong> Microsoft already turned off basic IMAP, POP, and EAS in Exchange Online. The leftover is SMTP AUTH, copiers, and client types Entra still labels legacy. Stolen passwords walk in that side door.</p>