As information technology (IT) success is both essential and elusive, researchers and practitioners are faced with an ongoing challenge to determine what IT capabilities should be developed to ensure IT success. Drawing on the paradox and ambidexterity theory, we highlight paradoxes in IT success and propose that firms manage these paradoxes by developing an IT ambidexterity capability. We hypothesize that IT ambidexterity capability enhances IT success, and that uncertain environments strengthen this relationship. Our hypotheses find support in a sample of 292 British high-tech firms. This research advances the theory for a more comprehensive understanding of the impacts of IT ambidexterity capability.