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oAuth 2.0 in G Suite and Microsoft 365

G Suite. Starting February 15, 2021, G Suite accounts will only allow access to apps using OAuth. June 15, 2020 — users who try to connect via non-oauth for the first time will no longer be able to do so. G Suite will enforce oAuth for both IMAP and SMTP protocols.

Microsoft Office 365 Exchange. On October 13th, 2020 Microsoft will stop supporting Basic Authentication for Exchange Web Services (EWS) to access Exchange Online. Microsfot will enforce oAuth for IMAP, but not for SMTP protocol (at least for now).

App Passwords and IMAP oAuth

There is a principal difference between G Suite and Microsoft 365 approaches in enforcing oAuth 2.0 …



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