[Item] Internet Information Services (IIS) items [Description] 
The uninstall process does not affect any application pools, Web sites, or Web applications in IIS on the local computer. Because the uninstall process removes the WebApplication folder and Web.config file for Master Data Manager, any Master Data Manager Web applications that require those files will no longer serve content. If users try to access the Web application, they will receive HTTP Error 500.19-Internal Server Error: "The requested page cannot be accessed because the related configuration data for the page is invalid." If you no longer require the Web site or application, and the application pool serving your site or application, you can use an IIS tool to delete them. For more information, see IIS 7 Operations Guide on Microsoft TechNet.