Sharepoint and PowerPivot: Connections fail to refresh in SQL Server 2008 Denali CTP3 Written by Jen Stirrup on 22 December 2011.
The data connection uses Windows Authentication and user credentials could not be delegated Written by Lee Graber on 09 February 2010.
Using VBA to enhance interactivity of PowerPivot reports Written by Javier Guillen on 11 September 2011.