Office 2007 Install Add-Ins
You can install Add-In software to most Office 2007 applications. Microsoft bundled add-in software with this release of Office. The software is included with 2007 but is not automatically installed. Here I am going to demonstrate how to complete the process with Excel 2007.
Click on the Microsoft Office Button \ Excel Options \ Add-Ins You can highlight the various add-Ins to get a brief description of what it does.
Make sure you have Manage: Excel Add-ins selected and click the Go… button and select the available Add-in from the resulting screen.
Click Yes to the confirmation screen.
Now just wait while Office installs the selected Add-Ins. When finished you can click the Add-Ins tab on the Ribbon to start using them.
There are also third-party Add-Ins as well. What are some of your favorites?

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Perhaps you should also explain in which folder a custom add-in file should be saved to have it appear in the list of add-ins. The folder path is different for Windows XP and Windows Vista.