nhoy, as others have said, you need to re-enter your hotmail password. You know that password, correct? If so, for now, do it from the blackberry using the email setup wizard. Then figure out your BIS password as a separate matter.
Also, it is possible you have a windows live password and a hotmail password, and perhaps you typically log into your email using the windows live password. You can use either one in practice, except for BIS. You must use the hotmail password for BIS. Just FYI if thie situation applies to you.