Mobile systems support portable, context-sensitive, and interactive computing that empower users to perform complex computations and communications on the go. Majority of the existing software systems run on web or workstation-based (traditional computing) platforms, lacking the capabilities of mobile systems, and are referred to as legacy software. The primary contribution of this research is a process-centric approach that enables automation and user decision support to modernize legacy software as context-sensitive and portable mobile-enabled application. Case study based validation complements the modernization process with scenario-based demonstration of the solution and qualitative evaluation of the modernized application. Evaluation results suggest that modernized application supports portable and context-sensitive computations, efficient utilization of device resources, and ease of use.