No more need for Windows Server IIS? Want to remove IIS completely from Windows Server using PowerShell? Start your PowerShell console as admin, and issue the following command in PowerShell:
Uninstall-WindowsFeature -Remove Web-Server
This will completely remove Internet Information Services (IIS) and its configuration! If you want to remove IIS web server, and be able to reinstall it later on, don't use the -Remove parameter:
Uninstall-WindowsFeature Web-Server
Uninstalls specified Windows Server roles, role services, and features from a computer that is running Windows Server 2012 R2. By adding the Remove parameter, also deletes feature files, or payload, from a computer. This cmdlet replaces Remove-WindowsFeature, the cmdlet that was used to uninstall roles, role services, and features in Windows Server 2008 R2.
If the Uninstall-WindowsFeature fails you can always resort to DISM's Disable-WindowsOptionalFeature. To remove or disable IIS-Webserver and its parent role IIS-WebServerRole execute the following command:
Disable-WindowsOptionalFeature -Online -NoRestart -FeatureName IIS-WebServerRole, IIS-WebServer
Before removing IIS from your server, don't forget to backup IIS and its configuration.