Traditionally, research related to Sustainable Information and Communication Technology (Sustainable ICT) has focused on the technological aspects, but there is an emerging stream of research, which looks at Sustainable ICT from the viewpoint of the social sciences. In this paper, we build on and contribute to this research by emphasizing the role of history in the shaping of Sustainable ICT. Rather than seeing the importance of history as pure technological determinism or path dependency, we draw on the historical turn in organizational studies to highlight the idea that history is malleable. This implies that organizational actors can reshape their past from the present, thus creating new conditions for the future. To highlight the importance of this theoretical conceptualization of history, we present a case study of the Nordic ICT company Tieto, where the heat recovery system of the Älvsjö data center (finished in 1978) was reconceptualized as “green” following the Green Information Technology (Green IT) trend in 2007. This way of theorizing organizational history could be used more widely within research into Sustainable ICT in order to understand why Sustainable ICT has become what it is, which also implies that we can re-interpret this history to shape the future of Sustainable ICT.