If you dont like to “click around :)” in Windows 2008 server “add role wizard” before installing OCS R2 you can run this from commandline before the OCS install.
Run this in a commandline on the Windows 2008 server:
start /w pkgmgr /iu:IIS-WebServerRole;IIS-WebServer;IIS-CommonHttpFeatures;IIS-StaticContent;IIS-DefaultDocument;IIS-DirectoryBrowsing;IIS-HttpErrors;IIS-HealthAndDiagnostics;IIS-HttpLogging;IIS-RequestMonitor;IIS-Security;IIS-WindowsAuthentication;IIS-RequestFiltering;IIS-Performance;IIS-HttpCompressionStatic;IIS-WebServerManagementTools;IIS-ManagementConsole;IIS-ManagementScriptingTools;IIS-ManagementService;IIS-IIS6ManagementCompatibility;IIS-Metabase;IIS-WMICompatibility;IIS-LegacyScripts;IIS-LegacySnapIn;WAS-WindowsActivationService;WAS-ProcessModel;WAS-NetFxEnvironment;WAS-ConfigurationAPI
