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There are a lot of really smart people that work with Excel and share their ideas on how to solve particular problems.  This is a page of links that I have found that solve particular problems.  I am sharing them here so others can use them, but also so I can find them again next time I need them.

Power Pivot Links
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Which versions of Office have Power Pivot?
Combine more than one file of identical structure into a single table in PowerPivot by editing the Data Source
Power Pivot Reference Card
What is eating up my memory the PowerPivot / Excel edition
DAX Formatter. This is a great tool to format your DAX code using spacing and new lines to make it easier to read
DAX Patterns. This is an interesting website that explains different DAX concepts and 'how' they can be reused to get particular outcomes
PowerPivot and SharePoint This is a very good article that talks about the limitations of hosting PowerPivot Workbooks on SharePoint.
Power Pivot Broken? Recently I had an issue where PowerPivot for Excel 2013 just stopped working. I tried all the normal tricks of disabling the addin and re-enabling it. This time it was really broken. I found this link; ran the automatic repair tool for PowerPivot (there is one for Power View too) and all fixed. Another option to try is first to run Excel in Safe mode (goto run and type "Excel.exe /safe" without the quotes); then turn off all Com Addins; then shut down Excel; restart in normal mode and turn them back on.
Memory Consumption. A colleague of mine Scott Senkeresty at Tiny Lizard recently did some investigation into Kasper de Jong's PowerPivot Workbook Memory VBA code. He has enhanced that code and made a new more complete version available. You can find it at the provided link.
Nested Filters in Measures I was doing some work for a client and need to work out how to refer to an Earlier row context in a Measure. Quick search found this.
VBA Data Model for PowerPivot There was a very good blog post by Dany Hoter on Rob's blog that explains how to use the VBA data model for PowerPivot v 2013. Here is the link.
DAX As a Query Language This is a good blog post I found that covers the basics of DAX as a query language.
DAX Black Magic This is a good blog post I found that explains how "black magic" works where the data table filters the lookup table. Warning; you really need to have some understanding of SQL and DB design to understand this.
Unnofficial Memory Patch for 32 bit Excel
Excel 2016 losing data model on save? There's a fix for that.
OLAP Pivot Table Extensions for Excel 2016.
Chart of Accounts/Income Statement - Derek Rickard YouTube Video
Connect to the Power Pivot Data Model from an External Program (Marco Russo)
Migrating from SSAS Tabular to Power Pivot. Nice article from Gerhard Brueckl
Power Query Links
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Power Query TechNet Forum
Use Power Query to combine data from identical files into a single table
Use Power Query to Access Files and Document Libraries in SharePoint
Power Query Reference Documentation
More Power Query Reference Documentation; including links down the bottom of the page for some PDF documentation
How to fix the error microsoft.ace.oledb 12.0 provider is not registered error
A fix for the dreaded Power Query error "Please remove and re-add the connection"
Query Folding
Excellent Video on Advanced uses for Power Query. This is a great link to a Power Query cheat sheet that outlines a lot of common uses and syntax.
This is a collection of tips on how to improve performance of your M-queries.
Power BI Links
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What's New in Power BI?
Theme templates for Power BI visuals
Bug Reporting
The official Microsoft Power BI Blog; with regular updates about everything that is new.
Power BI Helper
Power BI Desktop - Terms and Definitions
How to create a local Power BI desktop file and have it sync automatically to the Power BI service with OneDrive.
Power BI Support; Ideas and Self Help
An excellent article and video from "Guy in a Cube" Adam Saxon about the various options to share your Power BI reports in the Power BI Service. Excellent Infographic of Free vs Pro features from Gilbert
Power BI 12 month free trial
Power BI White Papers Calculate distance between 2 points in Power BI
Power BI Blogs interactive report
Grid Generator
Book list from Power BI Central
Power BI Features List
Theme File Generator
Best design practices for reports and visuals
Power BI Weekly A free weekly newsletter which collates articles from the whole of the Power BI ecosystem
Excel/VBA Links
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An excellent learning resource for learning VBA
Count unique values in a list using the VBA Collection Object. Look for the solution referencing the Collection Object.
A great resource with lots of samples of how to work with Pivot Tables using VBA
Ever want to give Microsoft feedback about Excel; or influence a new feature? This is the site you need.
Need help from Microsoft to get Power Pivot working with your version of Office? Go to this link and select "Office"
A nice way to provide a list of values in an Excel workbook; and then apply that list as a filter in a Pivot Table.
Turn off time grouping in PivotTables in Excel 2016 for Windows. A word of caution: The solution describes how to make changes to the Windows Registry. Before editing the registry back up any valuable data. Use Registry Editor at your own risk.
This article shows you how to use VBA to change a cell value in a closed Excel workbook.
Identifying PivotTable Collisions
Interesting Free Data Sets
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NSW Crime Stats
Various World Stats – Hans Rosling site
Good free calendar for PowerPivot from the Azure Marketplace
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Magnify/Zoom any screen in windows - Useful if you need to share a screen and zoom in to show formulas