Here is a list of how-to related to Microsoft Office products. It will be maintained and update regularly.
Remove Outlook account profile
Microsoft Community: How do I reset a profile in Microsoft Outlook 2013?
Open [Control Panel] → [Mail] then click on [Show Profiles…] to bring up [General] tab in [Mail] dialog. Now you may delete the unwanted profile or create a new one and set it in [always use this profile].