Digital content and data require software for interpretation, processing, and use. This requirement raises the issue of sustaining software functionality beyond its prime use, when it is fully supported and maintained. Virtualization and emulation are two techniques that can encapsulate software in its functional form; furthermore, emulation has recently gained traction as a viable option for long-term access to digital objects. At the same time, archivists, librarians, and museum curators have begun concerted efforts to preserve software that is essential for accessing the digital heritage. In this context the members of the panel will discuss relevant work that they have been involved in to address the goal of software sustainability and preservation