Deprecation of Basic Authentication in Office 365
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Microsoft has announced deprecation, or sunsetting, of legacy authentication protocols (Basic Authentication), beginning October 1, 2022. Basic authentication has been replaced with Modern Authentication, which supports Multi-Factor Authentication for enhanced security.

IMPORTANT:
What does this mean for your organization?
It is very unlikely your organization will be affected by the change as this is a phased rollout that has been occurring over a few years.
* Modern Authentication is already enabled by default for all Office 365 tenants.
* All versions of Outlook and Office that are still supported today support the use of Modern Authentication.
* All modern mobile devices, including iPhones and other iOS devices, as well as Android devices including Samsung and Motorola devices, support Modern Authentication in their native email client applications (including the Gmail app for all modern Android devices).
* Outlook for iOS and Android supports Modern Authentication and is the recommended email client for mobile devices
* While IMAP and POP protocols now support modern authentication, this is intended for continued use of third-party applications. Microsoft recommends the use of Outlook on the Web (OWA) over POP or IMAP in mail client applications, including Microsoft Outlook desktop applications, for end users email client access.
https://docs.microsoft.com/en-us/exchange/clients-and-mobile-in-exchange-online/deprecation-of-basic-authentication-exchange-online#pop-imap-and-smtp-auth

* AD Connect supports Modern Authentication for organizations with hybrid identity management.

There are a limited number of scenarios where an organization may have client applications that still use Basic authentication which could be affected. We have provided step by step instructions with links to resources for administrators to identify potentially affected applications and users in the following KB article for your reference:
https://support.zixcorp.com/app/answers/detail/a_id/1781

Microsoft has provided updates on this topic in a series of blog posts over the past few years to help administrators prepare for these changes to enhance security of Office 365 services and applications.
The official documentation including the announcement and resources to ensure your organization is prepared can be found here:
https://docs.microsoft.com/en-us/exchange/clients-and-mobile-in-exchange-online/deprecation-of-basic-authentication-exchange-online

To check out the latest blog post from Microsoft on this topic please refer to the following:
https://techcommunity.microsoft.com/t5/exchange-team-blog/basic-authentication-deprecation-in-exchange-online-may-2022/ba-p/3301866
Posted Aug 03, 2022 - 10:08 CDT
This incident affects: Office 365.