To assist IT managers in resolving Office 365 connectivity issues, Microsoft offers a web-based connectivity analyzer. It works with POP3 or IMAP clients and OAuth 2.0:
IMAP:
https://testconnectivity.microsoft.com/tests/O365Imap/input
POP3
https://testconnectivity.microsoft.com/tests/O365Pop/input
Those tools test IMAP and POP3 connectivity only – remember that application in your AD must be properly configured.
The post Office 365: OAuth 2.0 IMAP, POP3 email client connectivity tools first appeared on Blog | Limilabs.