Error with Exchange 2013 and Outlook 2013

Hello pals,
I have a problem when trying to create new accounts with Outlook 2013. It says that the connection to Microsoft Exchange is unavailable. Then it prompts me to enter a password and when I do so the same error message occurs again. And the process goes on and on. I am running Windows Vista. Please help me solve my problem as soon as possible.

The connection to Microsoft Exchange is unavailable. Outlook must be online or connected to complete this action.
