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Mobile business services have shown a lot of potential for improving the productivity of mobile workers. However, evaluating productivity impacts has been challenging due to the nature of these services. This paper aims to understand and evaluate productivity impacts of a mobile office service. The potential impacts are first identified in two mobile work groups by means of a literature review. After that, an empirical case study is conducted in a telecommunications company with knowledge workers and sales people using a mobile office service. The case study includes data from interviews, group discussions and a questionnaire (N = 115). The results show that the main productivity impacts from the use of the mobile office service examined in the case study are: the ability to accomplish tasks that need a rapid reaction or response, better situation awareness and better utilisation of idle time while on the move.