e area mobility with secure anytime, anywhere access to information and applications. Thus employees need: Communication and computing devices, for example a mobile phone, a laptop and maybe a personal digital assistant (PDA) equipped to communicate and synchronize activities, and possibly also a fixed phone at the office desk. Service and application packages personalized for the duties and job of the individual. Remote access to enterprise network and resources when on the move or working from home. 2.3.4 OUTSOURCING AND NEW SERVICE PROVIDERS As we mentioned above, enterprises want to focus strictly on the core business and outsource non-core activities and services. In principle, everything except for core business can be outsourced. A new market for a great variety of service providers is here and evolving. It can be regarded as evolving new enterprise segments for the network operators, service providers and suppliers. In non-communication areas we have for a long time seen outsourcing of clean- ing, housing, catering, and production of commodity components, for example printed boards. In communication we have seen telecommunications being outsourced, first for long distance then for internal communication. A main example is Centrex (centralized ex- change), where all internal communication is handled by the network operator's public switches, instead of an enterprise-owned PABX (private automatic branch exchange) for intra-site communication. In the same way VPNs (virtual private networks) may replace private networks or leased lines when different sites are to be interconnected. Some examples of new roles for service providers are presented in Table 2.1. In some cases a service provider takes on only one role, but in many cases two or more roles are taken on. One example of the latter is the former telecom administrations; that is, the national, government-owned telecom operators that have a long and broad experience from running networks and services although in a monopoly situation. The example list is v