A qualitative study conducted in four lower secondary schools in Norway explored teachers' and school principals' experiences of collaboration with a variety of extended services (ES). Particular attention was directed to the ways (if any) they perceived collaboration to be relevant to helping teachers support pupils with mental health problems through their everyday social and pedagogic practices. Findings of the study indicated that teachers valued initiatives that could help develop mutual understandings of teachers' and ES professionals' roles and responsibilities. Initiatives to build inter-professional relationships were perceived as laying the foundation for more productive collaboration. However, to be able to provide coherent, sustained support in the classroom, teachers needed guidance from ES professionals. This required a shift in collaborative processes away from a focus on individualized pupil support towards helping teachers support pupils through their classroom-based social and pedagogical practices. Implications for policy and practice are discussed.