http://blogs.msdn.com/b/girishp/archive/2011/10/07/excel-dashboards-on-project-portal-for-tfs-2010-failed-to-refresh.aspx  I had this nagging problem on one instance where the Excel dashboards on a TFS 2010 instance would not bring up the data. Here is how I fixed it (hopefully) someone else will benefit. There could be more than one reason for this error to manifesten-USTelligent Evolution Platform Developer Build (Build: 5.6.50428.7875)