Deprecation of basic authentication in Exchange Online
Introduction Microsoft has removed Basic authentication and the smtp auth option in Exchange Online services, i.e. Exchange Online for Exchange ActiveSync (EAS), POP, IMAP, Remote PowerShell, Exchange Web Services (EWS), Offline Address Book (OAB), Outlook for Windows, and Mac. The Microsoft Security defaults configuration and modern authentication are the successor technologies and use OAuth 2.0 ... Read more
