Using a case study of a financial service provider, this research provides a next step toward an answer to the question about the importance of an employee's attitude toward a newly introduced information system in light of a mandatory usage setting. Based on the Commitment to Change Model, the paper argues theoretically and provides case study evidence that negative attitudes toward new information systems influence work-related and health-related outcomes. The observed case indicates that a negative evaluation of a new financial information system leads to negative consequences such as decreased organizational commitment and overall job satisfaction as well as an increased turnover intention and a higher number of sick days. The results implicate that work- and health-related consequences are potential dependent variables for technology adoption research and that practitioners have to address these issues during the implementation of information systems in organizations.