The original for Outlook has been discontinued and is no longer supported in modern versions of Office 365. While once a popular free add-on for managing small business sales and marketing within Outlook, Microsoft has shifted its focus to cloud-based alternatives like Dynamics 365 Sales and third-party solutions. Status of Microsoft's Solutions
Discontinued after Office 2013; does not work with Office 365 or Outlook 2016 and later.
Specifically tailored for small business owners who want to centralize customer details without full-scale CRM complexity.