Hi, thank you for contacting JustAnswer.com. My name is Russell. I will do my best to provide the right answer to your question.
Clearly, something is wrong in the configuration of the mailbox setup.
I don't know what it was at this point. Could you copy the full and exact error message?
As it is, it seems like an error typical of a Microsoft Exchange setup, not 'standalone' or one-computer MS Outlook setup.
I'm glad to hear that the problem was solved.
Thank you for asking your question here at JustAnswer.com.