Message from Square Enix:
"Whilst we have loved seeing you enjoy playing Order of War on Steam, unfortunately it is no longer viable for us to continue to run the multiplayer servers due to the low volume of traffic and so the servers were switched off on September 1st, 2013. The multiplayer aspect of Order of War and Order of War: Challenge have subsequently ceased to function, and customers will notice that Order of War: Challenge has been removed from their Steam library. For those who have been playing our game, we thank you for your support and hope you had fun. If you have any further questions about this, please contact our customer support team at http://support.eu.square-enix.com/main.php?la=2&id=592"