Open Group Policy Management
Create or edit the GPO that will be used to force the new setting.
To create a new GPO right-click the container Group Policy Objects and select New.
To edit an existing GPO, select it, right-click and press Edit.
Browse to User Configuration -> Policies -> Administrative Templates -> Windows Components -> Internet Explorer -> Compatibility View and select the setting “Use Policy List of Internet Explorer 7 sites”
Enable the setting and then press show
Add the site that you want to force to run in Compatibility View, in this case http://www.contoso.com
The new policy should now work after the user has either logged off and logged in again or if the command gpupdate /force is entered in CMD.