Power Pivot for Excel 2013 is ONLY standard in the Enterprise versions of Excel 2013. Individuals who have purchased the Microsoft Office 365 version of Excel 2013 are unable to add the Power Pivot Add-on. In fact, Microsoft has made it extraordinarily difficult for individuals to purchase the expanded version of Office. In my opinion, this was a bad move on the part of Microsoft. Perhaps Microsoft will turn it on for the subscribers of Office 365 in the year 2014 or 2015.

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Reply from Richard Rost:

I agree. Bad move on Microsoft's part.