mirabyte Feed Writer Wed, 22 Jul 2009 12:08:02 -0500 Fri, 18 Sep 2009 12:33:34 -0500 http://www.chall.com/support_main.php Challenger will be conducting a service upgrade September 1, 2011. In order to perform this upgrade, the Challenger learning portal will be offline beginning at 6 AM Central Time. The work involved in the upgrade may last as long as 3 hours. During this time, you will be unable to access your learning portal Web site. Please be assured that all scores and reports are safe and will not be affected by our service upgrade Tue, 30 Aug 2011 10:01:24 -0500