Exchange Online, Basic Authentication end is near…

Microsoft is proactively working on securing their Exchange Online environment. Making your and indirectly other customers environments safer. For now Microsoft is going over all tenants and they will start disabling Basic Authentication. This will include all of the following services: Exchange Web Services (EWS), Exchange ActiveSync (EAS), POP, IMAP, Remote PowerShell, MAPI, RPC, SMTP AUTH and OAB. Microsoft will start disabling basic authentication permanently beginning October 1, 2022. So if you still have applications that cannot work with modern authentication, it is 5 to 12, make sure they can quickly.

Early 2022 Microsoft will selectively pick tenants and disable Basic Auth for all affected protocols except SMTP AUTH for a period of 12-48 hours. After this time, Basic Auth for these protocols will be re-enabled.

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