Office 365 IMAP, POP, SMTP OAuth2 with Client Credentials June 19, 2023 in Uncategorized See https://learn.microsoft.com/en-us/exchange/client-developer/legacy-protocols/how-to-authenticate-an-imap-pop-smtp-application-by-using-oauth#use-client-credentials-grant-flow In my opinion, this is still too complicated. An “easy button” is needed.
