Update: The full timeline for retirement of Basic Authentication in Exchange Online is now published in Basic Authentication Deprecation in Exchange Online – September 2022 Update.
In February 2021...
Updated Sep 01, 2022
Version 19.0
Blog Post
Basic auth is currently disabled in our tenant with an organizational level default Authentication Policy.:
Set-OrganizationConfig -DefaultAuthenticationPolicy <PolicyIdentity>
However, we have a small subset of accounts which still require basic auth for EWS and IMAP so we have a second Authentication Policy which allows basic auth over these protocols, and this policy is applied individually to these accounts. This works as described in this doc: https://docs.microsoft.com/en-us/exchange/clients-and-mobile-in-exchange-online/disable-basic-authentication-in-exchange-online#how-basic-authentication-is-blocked-in-exchange-online
When Microsoft disables basic auth in Oct 2022, will that override and break the Authentication Policy-based exception we have applied to our small subset of accounts which still need basic auth over EWS and IMAP?