IIS is not selectable on web server portion of configuration of Service Desk.
Article ID: 53233
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To install the IIS 6.0 Management Compatibility Components and CGI by using the Windows Server 2008 Server Manager:
Click Start; click Administrative Tools and then Server Manager.
In the left navigation pane, expand Roles, and then right-click Web Server (IIS) and select Add Role Services.
On the Select Role Services pane, scroll down to IIS 6 Management Compatibility. Scroll to Application development and select CGI
Select the check boxes for IIS 6 Metabase Compatibility and IIS 6 Management Console.
Click Next from the Select Role Services pane, and then click Install at the Confirm Installations Selections pane.
Click Close to leave the Add Role Services wizard.