This article, which draws on a quantitative survey of a sample of the working population in France, takes working environments as a starting point. It presents an overview of specific configurations, which helps to explain the articulation between work and the business enterprise, both at home and in mobile situations. In this way the concept of telework is qualified. The proliferation of workplaces is related to new arrangements between the private and professional spheres, especially regarding uses of the mobile phone, the fixed phone and the home computer. The boundary between private and professional is thus described in a new light by bringing together relations with mobility, professional identities, and mixed uses of ICT.