Announcing OAuth 2.0 support for IMAP, SMTP client protocols in Exchange Online - Microsoft 365 Developer BlogAnnouncing OAuth 2.0 support for IMAP, SMTP client protocols in Exchange Online Last year, we announced that we would enable OAuth 2.0 support for IMAP, SMTP AUTH protocols and retire Basic Authentication access to Exchange Online mailboxes. Today, we’re announcing the availability of OAuth 2.0 authentication for IMAP, SMTP AUTH protocols to Exchange Online mailboxes. If you have an existing appli
