IT enabled MailTips in Outlook on Monday, October 9, 2017. This is to help avoid common, but potentially costly or embarrassing mistakes. MailTips alerts can be triggered by actions including clicking Reply All to a large recipient list, sending sensitive information to someone outside your organization, or sending a message to someone who is out of office.
Issue: Certain non-browser apps don't support two-factor authentication. This lack of support means that if you're using two-factor authentication, the app won't work. To get around this problem, you can create an auto-generated password to use with each non-browser app, separate from your normal password.