Exchange Online Basic Auth Deprecation

Estimated start time: October 25, 2022 11:00 AM

Affected services

Exchange Online

User impact

If action is not taken, users with Basic Authentication enabled for the affected protocols will be unable to sign in.

Action needed

Today, we started to disable basic authentication for any protocol not opted-out prior to September 30, 2022.

For more information see the “Basic Authentication in Exchange Online - 7 Day Notice” notification in Message Center.

If you need to re-enable a protocol, you can do so once by following the process here.

Additional diagnostics

Please verify your clients are using clients configured with Modern Authentication.

Outlook 2013 – Office 2013 client applications utilize legacy authentication by default. Users may need to update their registry to fully enable Modern Authentication. Please reference this document for more information.

Exchange ActiveSync – Users may need to remove and re-add their account to fully switch to Modern Authentication on mobile devices using EAS protocol.

POP/IMAP clients – If your POP/IMAP clients or apps are unable to connect, you might need to change your email client to one that supports Modern Authentication (Outlook does not support Modern Authentication for POP/IMAP accounts), or switch to Outlook on the web. You can use your browser and access Outlook on the web via https://outlook.office.com.