What is Deloitte OnLine? It is Deloitte’s global client extranet currently used by more than 50,000 people worldwide. Deloitte OnLine is a Web site designed to enhance communication and collaboration between the people of Deloitte and our clients. Within Deloitte OnLine you have access to information relevant to your business, tools to improve efficiency and insight into how Deloitte can assist you in solving your business challenges.