Basic Authentication Deprecation in Exchange Online – Time’s Up

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https://techcommunity.microsoft.com/t5/exchange-team-blog/basic-authentication-deprecation-in-exchange-online-time-s-up/ba-p/3695312

In early January 2023, we will permanently turn off Basic auth for multiple protocols for many Exchange Online tenants.

We want to thank you once again for all the hard work you’ve done to prepare your tenant and users for this change, and for your part in helping secure our service and your data.

How Will This Change Happen

Beginning in early January, we will send Message Center posts to affected tenants about 7 days before we make the configuration change to permanently disable Basic auth use for protocols in scope (we are still not touching SMTP, but you should).

Soon after basic auth is permanently disabled, any clients or apps connecting using Basic auth to one of the affected protocols will receive a bad username/password/HTTP 401 error.

The only remediation for this is to update the client or app or use a different client or app that supports Modern authentication….

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