Interface not registered (Exception from HRESULT: 0x80040155) – Microsoft Office/Outlook Error
If you recently uninstalled Outlook 2013 or Outlook 2016 or have a problem with your Outlook installation then you may encounter the following error messages:
Unable to cast COM object of type ‘Microsoft.Office.Interop.Outlook.ApplicationClass’ to interface type ‘Microsoft.Office.Interop.Outlook._Application’.