Modern Authentication as implemented by Microsoft is more secure and provides a better user experience given the distributed, federated nature of the modern web experience. With those few exceptions, on December 31, 2022, Basic Authentication was disabled for good, which extends to migration projects. ![]() Still, Microsoft urges customers to move away from using Basic Authentication with SMTP-AUTH whenever possible. ![]() The latter is to support multi-function devices such as devices and scanners that cannot be updated to use Modern Authentication. Basic Authentication will remain supported in Exchange Server on-premises products, and for SMTP-AUTH in Exchange Online. Microsoft has recognised the high risk associated with this legacy authentication approach and has pushed for a shift to a more secure form of Modern Authentication.
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