bad username or password message means the unsername or password is incorrect.
its possible the mailbox cluster may be getting defragmented, theres one this week but cant remember when. try it about 4pm+ ish and if it still isnt working try webmail. if you can access webmail then its the program if you cant access webmail try selfcare to double check the password
if you can get into selfcare and not the other 2 then its the email server or cluster thats the problem.