The purpose of this paper is to explain how the constraints of legacy interorganizational information infrastructures(IOII) can be overcome by using the bootstrapping and adaptiveness design principles proposed by Hanseth andLyytinen. Information systems are no longer typically implemented in a vacuum as standalone applications andinertia effects from an existing installed base can increase based upon additional components and interactions.Overcoming this inertia can be effectively achieved by designing with bootstrapping and adaptiveness in mind. Thetheoretical perspectives used for this study to describe the organization and environment are rational choice andinstitutional theory. A conceptual framework is offered based upon a review prior research and then validatedthrough a case study of a public sector interagency IOII. This study contributes to II research by specifyingantecedent conditions leading to inertia in the installed based, and by highlighting the critical role of positivenetwork effects in overcoming legacy constraints.