The .NET Framework is the easiest way to build apps on the Microsoft platform. You can download Visual Studio Express for free, and be coding in just a few minutes. You can also use the .NET SDKs and targeting packs to build apps for a given Microsoft platform, such as Windows Azure.
OpenSpan, Inc. OpenSpan is a leading provider of application integration and automation software for the enterprise. Global 2000 enterprises leverage the OpenSpan Platform to integrate applications, service-enable legacy systems, automate business processes, extend functionality and build new composite applications in order to realize immediate value on their IT investments.