We cannot read minds, so perhaps you could provide some information.
Include such things as:
1. Outlook version
2. Precise steps that produce this error message.
3. What changes were made immediately before "a couple of days ago."

Signature
Russ Valentine
[MVP-Outlook]
>A window pops up and tells me that "the account you have added is not fully
> configured. It may not work properly until you reconfigure it"
[quoted text clipped - 6 lines]
>
> SCG