Starting about 1:00 am Sunday outlook.com stopped retrieving emails from AT&T U-Verse/Yahoo.  Going into options there was a message next to the account that stated  the following message:

There was a problem getting messages from your other accounts. 

I went into accounts and the AT&T/Yahoo account had the error and the details stated:

7/21/13 We couldn't get your messages: Make sure your user name and password are correct.

Sorry to say that no my credentials are not incorrect, I tested by using a local email client using the same credentials and I was able to get pop access to my email.   I would say that with the time frame (usually a maintenance window) that either Microsoft or Yahoo changed something that prevents mail being received at Outlook.com

My number one issue is getting this working again and Microsoft and AT&T Yahoo doesn't provide any type of real support options.

My second  issue is why did I have to dig all the way down into settings to find out that Outlook.com is having trouble.  Couldn't they have put a message on the main email page?

What can be done to get resolution to this issue?

Thanks...