People are doing cool stuff with Excel 2013 like United Nations Energy Consumption Insights Done with Microsoft Excel 2013, PowerPivot, Power View and the Azure Marketplace .
What are you doing with Excel 2013 and Dynamics GP?
United Nations Energy Consumption Insights Done with Microsoft Excel 2013, PowerPivot, Power View and the Azure Marketplace | Extended Results, Inc.
Archived post from 2013. Dynamics GP and the links it points to have changed since; check current documentation before relying on version-specific steps.