I just ran into this on 5.0.16 NE. Tested bulk provision with empty password field in the CSV file, so the test account got a random password and was set to "must change password".
When I go to the virtual host URL for that user and log in, I am prompted to choose a new password, with the Username and (old) Password fields pre-filled. Username is just filled as <username> not <username>@<domain>.
Entering a password in New Password and Confirm, then clicking Log In, gets
Quote:
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The username or password is incorrect. Verify that CAPS LOCK is not on, and then retype the current username and password.
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If I change the Username field to <username>@<domain>, all is well.
EDIT: the bug has even worse effects if the user is setting up ZCO and only enters the username without domain. Effectively you get into a loop and must force quit Outlook.