Using older versions of Outlook for Mac in business environments
Having this issue as well. I deleted and added exchange accounts, but having the issue again. I have two emails and both are having the issue. The passwords work fine if I log in on a web browser. But on Mac Mail it won't accept the passwords at all. Also, deleted the exchange accounts and tried to add back, but it's not accepting my passwords. It will still accept them if I log in on a browser.