I installed the Outlook plug-in but it will not load. Went through the troubleshooting steps in the user guide, but still shows as disabled. I cannot manually enable it. So I removed it from Outlook and then tried to add it. But I got the error "C:\Program File (x86)\SugarCRMInc\SugarCRM Outlook Plug-in\SugarOutlook.vsto is not a valid Office Add-in."