This document provides guidance on migrating applications from older versions of ASP and .NET to newer versions. It recommends a gradual migration approach, starting with addressing the most important applications first. The document reviews changes between technologies like Classic ASP, ASP.NET 1.1, and newer versions. It suggests architectural best practices like separating UI from business logic and leveraging shared services. Future .NET versions may support multiple runtimes and continue enhancing frameworks like MVC and Entity Framework.