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Impact of 'Microsoft Exchange Online' dropping support of 'Basic Authentication'

Would IMAP client code connecting to Office only start to fail after basic authentication is dropped in Oct 2020

Specifically would code like the one below start failing?

// Create an imapclient with host, user and password
ImapClient client = new ImapClient();
client.Host = “”;
client.Username = “username”;
client.Password = “password”;


I have observed your requirements and have created an issue with ID EMAILNET-39749 in our issue tracking system to further investigate this on our end. This thread has been linked with the issue so that you may be notified once the issue will be addressed.

Hi there,

I am having the very same question. Please let me know if there is any news.



We request for your patience and will share the feedback with you as soon as the issue will be fixed.