-related services to small and medium enterprises (SMEs). Management service provider. Management of information systems (IS) including for example monitoring and operations. ESP (1) Enterprise service provider. Offers Internet services to enterprises. ESP (2) E-business service provider. Provision of services for e-businesses including e-commerce both B2B and B2C. E-mail and messaging service provider. Provision of services and support for e-mail, messaging and scheduling. Business service provider. Offers services such as reporting of activities, results of enterprises, accounting and human resource management. Development environment service provider. Offers software development environment and tools. Vertical service provider. Offers a complete service including in principle everything to run a certain service. Examples are services, networks, terminal operations and maintenance of these. One example is a global video conference system at an enterprise site. Another example is 'Call Centre' where calls from customers are directed to a specific call-centre answering and acting on behalf of the enterprise. In the ideal case the calling customer should feel that it is the addressed enterprise that is answering the call. 2.3.5 ENTERPRISE SEGMENTS In this book, three 'Enterprise segments' are defined below, primarily based on size, which is one of the key parameters that determine the type of service needs. The needs for external and internal communications and also administration and business processes are to a large extent size dependent. The large enterprise, counted in number of employ- ees, normally has a larger need for applications in order to maintain a complex network of customers, employees, local offices worldwide, subcontractors and SO on. However, within each segment there are considerable variations in the type of services used, com- munication intensity, complexity, and SO on depending on the type of business operation. End-User Needs and Demands A hightech company can be anticipated to have other n