This paper focuses on the ways IT can be used to provide supporting services. We refer to these IT-mediated support services as supporting services functionality (SSF), which is the extent to which a web- site uses IT to provide services that support a core product or service transaction, and to help customers reach their shopping goals. Our research addresses several important research questions: How can SSF be fully realized; i.e., what IT-mediated supporting services are possible online? What are the salient effects of SSF in the B2C environment? How do these effects influence customers’ perceptions of a website relative to the extensively researched service quality construct? What variables are salient when an individual is both a customer and a user of technology? To answer these questions, our investigation of SSF views users of B2C websites as both IT users as well as customers. We develop a theoretical foundation that integrates key constructs and theories from services marketing and technology acceptance research. We then outline an empirical study designed to test and validate the importance of the construct of SSF. Finally, we dis- cuss the results of the study and implications for both theory and practice.