![]() October 2022 – the complete shutdown of basic authentication for connections to Exchange Online, announced in September 2021.However, basic auth will be blocked for the unused protocols, with a warning issued 30 days beforehand in the Microsoft 365 Message Center in your tenant. ![]() February 2021 – Microsoft announces that basic authentication will not be blocked for now for any protocols that a tenant is using.A more precise date is yet to be announced. Second half of 2021 – that’s when basic authentication will be disabled for all tenants.October 2020 – basic auth will be disabled for tenants which do not effectively use it.Octo– the initial date for disabling basic authentication in Exchange Online for all tenants.Security Defaults block all legacy authentication protocols. ![]()
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