Microsoft SOAP ToolkitMicrosoft SOAP Toolkit 
Microsoft SOAP Toolkit (wsdlgen3.exe). Microsoft SOAP Toolkit can be used to add XML Web Service functionality to COM components and applications.
Lightweight XML-Based SOAP Protocol Toolkit for Fast, Secure, and Scalable Web Service Integration
Simple Object Access Protocol (SOAP) is an XML-based protocol designed for reliable information exchange across distributed systems. It enables clear client–server communication, manages operational parameters, and handles return values with structured precision. Using XML for all data transfer, SOAP ensures interoperability across diverse platforms—ideal for developers seeking stable service communication and enterprise-level integration.
Microsoft SOAP Toolkit adds powerful XML Web Service capabilities to COM components and classic applications. This lightweight solution simplifies creating automated web services on an open, shared web infrastructure. Compatible with major internet protocols such as HTTP, SMTP, and MIME, it supports broad use cases—from messaging pipelines to RPC workflows—and can establish secure SSL connections. Although all SOAP Toolkits have since been replaced by the Microsoft .NET Framework, version 3.0 remains the final supported release.