There are many good reasons why organizations should perform software architecture reconstructions. However, few organizations are willing to pay for the effort. Software architecture reconstruction must be viewed not as an effort on its own but as a contribution in a broader technical context, such as the streamlining of products into a product line or the modernization of systems that hit their architectural borders, that is require major restructuring. In this paper we propose the use of architecture reconstruction to support System Modernization through the identification and reuse of legacy components as services in a Service- Oriented Architecture (SOA). A case study showing how architecture reconstruction was used on a system to support an organization?s decision-making process is presented.