I am able to send and receive email with both the Outlook Client and the web client.
The links that I provided indicate that the solution you suggest, changing the password, did not work back then and does not work now. [As I stated in my original post] I have changed my password via the web client numerous times without any change in the behavior of the system.
Today was especially bad and I had to turn of my automatic query and rely only on manual send and receive (which also indicates that the password works). Manual send and receive almost always works, but not always. Occasionally I will receive the same pop-up window that I receive when I have automated queries turned on.
I normally have my automatic query set to 5 minutes for a subset of Cox emails and 7 minutes for the rest. I did that so that I wouldn't burden the Cox email server too much, but I don't think it made any difference.
Today, when I checked the Outlook error messages (through the Outlook Send/Receive Progress window), I saw that the error message states that "The server responded: -ERR Account is temporarily unavailable." So, I'm very confident that the problem is not with the Outlook client as it has no problems whatsoever with other email servers and it works with the Cox server most all of the time, except for the random pop-ups for no real reason based on the Cox server response to a specific query.
Also, please note that the web client does not like Chrome or Firefox when I attempt to change the password. I can only change my password using Explorer (I haven't tried Edge). When I use Chrome or Firefox, I receive the following message after I click on Change Password in settings: "We're sorry, an unexpected error has occurred. Please try again. If you need help, contact Customer Support or Live Chat for assistance." This has been going on for quite some time.
-DV