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Enable Power Pivot
Microsoft: How to Enable Power Pivot
Here’s how you enable Power Pivot before using it for the first time.
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Go to File > Options > Add-Ins.
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In the Manage box, click COM Add-ins> Go.
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Check the Microsoft Office Power Pivot box, and then click OK. If you have other versions of the Power Pivot add-in installed, those versions are also listed in the COM Add-ins list. Be sure to select the Power Pivot add-in for Excel.
The ribbon now has a Power Pivot tab.
Getting Started with Power Pivot
Please see Microsoft's article: Power Pivot - Overview and Learning