Mobile technologies offer major opportunities for improving the productivity of business users and running business processes with higher effectiveness and efficiency. This particularly applies for service and maintenance processes of complex technical systems which are highly dependent on high-quality information. However, the proliferation of mobile business applications is still limited and we are lacking a deeper understanding of how they can be utilized successfully. Thus, the objective of this study is to gain a better understanding of mobile business applications' effectiveness in the context of service and maintenance processes. For this purpose, we adapt the DeLone and McLean IS Success Model to this particular context. The model is validated with survey data from 374 mobile service users in periodical technical vehicle inspection. Our results indicate that, besides system quality, the quality of process support is the main determinant of individual benefits from using the mobile devices in service and maintenance processes. The study's findings support practitioners in understanding the levers with which to improve mobile business applications. By empirically validating a success model for such applications, the study's results advance theoretical development in the area of mobile service and maintenance systems and present a basis for further research in this field.