They can be longer, but only the first eight characters will be used. Passwords must contain at least two letters and one nonletter character.
Any character is valid, including spaces, tabs, and special characters.
Passwords cannot be your login name, the reverse of your login name, or your login name shifted by one or more characters. A new password must be different from your old password by at least three characters. Changing the case of a letter doesn't make it a different character. Click on Enter. Enter your old password and hit Enter.