The open source course management system Moodle, which a great number of organizations worldwide have adopted, is designed to help instructors deliver course materials to their students from a social constructivist perspective. The aim of this research is evaluate the acceptance and use of Moodle as an open source application from the viewpoint of both professors and students at the American University of Beirut. The theoretical framework for this study is drawn from the Unified Theory of Acceptance and Use of Technology (UTAUT) to investigate user intentions toward Moodle. The participants were 189 professors and 1,867 students who completed an online survey, evaluating a set of 30 items on a scale of five that reflected the UTAUT constructs applied to Moodle. An exploratory factor analysis was employed and generated five factors: community influence, satisfaction, service quality, learnability and technical quality. Repeated measures ANOVA showed community influence as the highest rated by participants, followed by satisfaction, service quality, learnability and technical quality. Also, two open-ended questions were included to solicit comments from users about various features that should be integrated into this free open source application.