PowerPivot for Excel started as a free download from Microsoft for Excel 2010, and is now included with Excel 2013/2016/365 'Plus' Editions.
There are three advantages of PowerPivot over a regular pivot table:
The technology behind PowerPivot is actually a version of SQL Server INSIDE of the Excel spreadsheet.
The following versions that are supported:
How to determine what version you currently have.
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