This tool is intended for developers and IT professionals to simulate load on a BizTalk Server. Using this tool, you can simulate load to instrument performance and stress against a BizTalk deployment. In addition, this tool may also be extended by developers to simulate load for custom transports. This tool should be used in a test environment only, and should not be used in a production environment. This tool is provided "as-is" and is not supported.
Download LoadGen Here: http://www.microsoft.com/downloads/details.aspx?FamilyId=C2EE632B-41C2-42B4-B865-34077F483C9E&displaylang=en