I'm having the same problem. Accessed webmail from the road yesterday, had to change my password. Now Outlook won't work from home. Same UserName and Password box continually popping up as others are mentioning. Tried setup in Outlook to be sure password was updated. No progress.  Have checked other settings, too. U-verse support isn't able to solve the problem although it is obvious that the U-verse change is related to the Outlook problem. Using Yahoo netmail isn't an acceptable option longterm although I can at least get to new messages there for the moment.

Any advice?