This paper from ECMS describes some of the results of a search for a microsimulation software and analyzes new software technologies (among others Web-based application development), which can be applied to develop microsimulation models. First, the application field and some of its major characteristics and requirements are introduced. After a short introduction and classification of microsimulation models, basic technological approaches for microsimulation model implementations are presented. The two major solutions for realizing Web-services are J2EE and .NET. These two technologies are compared and their impact on microsimulation and related software technology shortly discussed.