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March 24, 2022

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Turned-Off Basic Authentication – Exchange ActiveSync

Exchange Online, Microsoft 365 Suite, Microsoft 365 Experts, SharePoint Development

From Microsoft Corporation
Technical Bulletin MC345919 · Published Mar 23, 2022

Message Summary

We are making some changes to improve the security of your tenant. We announced in 2019 we would be retiring Basic Authentication for legacy protocols and in early 2021 we announced we would begin to retire Basic Authentication for protocols not being used in tenants. You can always read the latest information about our plans to turn off Basic Authentication here .

Today we turned off Basic Authentication for the Exchange ActiveSync protocol in your tenant. Based on our telemetry, no-one is currently using Basic Authentication with that protocol in your tenant and so we expect there to be no impact to you.

We have previously communicated this change via Message Center: MC191153 on 9/20/19, MC204828 on 2/26/20, MC208814 on 4/6/2020 and MC23771 on 2/4/2021, and most recently in the Basic Authentication – Exchange ActiveSync Message Center post sent approximately 30 days ago.

How this will affect your organization:

Users in your tenant will now be unable to access their Exchange Online mailbox using Basic Authentication and that specific protocol.

What you need to do to prepare:

This is for your awareness only. You have the ability to re-enable specific protocols for the time being – read more here.
Additional information


QuixTec provides this and other technical bulletins unaltered from Microsoft. As an authorized Microsoft Partner, we ensure that all our solutions we deliver to you include the latest Microsoft updates.

ABOUT US: QuixTec, LLC is a U.S. certified Veteran Owned, modern DevOps organization and Microsoft Partner that specializes in Microsoft SharePoint, Microsoft365 expertise & HTML5 technologies for small to enterprise-sized organizations. The founder, Richard, has 30 years of experience working with several notable companies that include World Vision, Expedia, Microsoft, Levi Strauss, NASA, Boeing Aerospace, Los Alamos National Laboratory, and the U.S. Air Force, to name a few.  QuixTec is in the Seattle area. Phone today for a free consultation and project estimate:

(425) 367-9025


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