After your CRM instance is updated to a different major version, CRM for Outlook is disabled and appears grayed out. If you attempt to access one of the CRM folders, you encounter the following error message:
"You are running a version of Microsoft Dynamics CRM for Outlook that is incompatible with this Microsoft Dynamics CRM organization (<version number>)."
"You are running a version of Microsoft Dynamics CRM for Outlook that is incompatible with this Microsoft Dynamics CRM organization (<version number>)."