If you've implemented multi-factor authentication, you should disable the default basic authentication to make sure attackers can't exploit it. Attackers will go after weaker credentials and passwords ...
Microsoft this week again appealed to organizations using Exchange Online to move away from using "Basic Authentication," reminding them that support for it will get dropped, starting on Oct. 1, 2022.
Microsoft says that Basic Authentication's removal from Exchange Online is being postponed until the second half of 2021 due to the current situation created by the COVID-19 pandemic. "In response to ...