Configuring Excel Services in SharePoint 2010

Problem

Configuring Excel Services in SharePoint 2007 is fairly simple. However, in SharePoint 2010, Microsoft has changed the "Unattended Service Account" to use an "Application ID" from the "Secure Store Service Application". If you don't setup an Unattended Service Account then all of your data connections in Excel will need the credentials within the connection or will need to revert to the current user.
Configuring the "Unattended Service Account" means you can set your authentication on the Excel data connection to None and use the credentials in the Secure Store Service application instead.
This is an easy step to miss.

Solution

Please follow the steps below to correctly configure SharePoint 2010 Excel Services to use an Application ID from the Secure Store Services.

More: http://www.mssharepointtips.com/tip.asp?id=1041

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