Andrew Zhu has six years of experience of software development and information technology: three years in Java, three years in .NET/C#. During these years, he designed and developed applications including computer language complier, SQL interpreter, Library book management application, online sale application based on JSF/Java, and SharePoint OA application. Two and half years ago he joined Microsoft. Since then, he has been helping developers solve IIS and BizTalk problems, developing .NET/Workflow/ASP.NET/SharePoint applications for his customers. Now, he is a Technology Support Engineer working in Microsoft (Microsoft Globe Tech Support Center), Shanghai. He has been supporting WF4 since its beta1 version.