You can uninstall the Outlook Add-In from a Windows computer by using the uninstallation option in the Windows Control Panel.
Procedure
- 
Log on to the Outlook Add-In computer as local Administrator or as a member of the Administrators group on that computer. 
- 
Open the Control Panel, and based on your Windows operating system, find the option to uninstall programs. For example, for Windows Server 2012 and Windows 7 computers, open the Control Panel, and under the Programs section, click Uninstall a program. 
- 
From the list of programs, click OutlookAddInClient and then click Uninstall. The uninstallation wizard opens. 
- 
To uninstall the application, click Remove and then click Yes to confirm the uninstallation. The Outlook Add-In is successfully uninstalled.