The default installation folder C:\Program Files\Microsoft Enterprise Library 4.1 - October 2008

• Bin - contains the binaries you can use in the application. 

Also, the configuration editor EntLibConfig.exe which can be used to create and edit configuration files for EntLib

• Docs - documentation
• Src - contains the installer file for the Enterprise Library source file
• Visual Studio Integration - contains binaries that make the configuration Editor available in Visual Studio

The installer also puts the original source code in C:\EntLib41Src

• bin - contains the same as the bin above

• Blocks - contains a solution that houses all 42 Enterprise Library projects. There is also a second solution that additionally contains unit test projects, and the actual unit tests to verify correct working of Enterprise Library as you change it.

  This is a great value that allows you to feel comfortable editing this pile of code while being able to prove you have not broken anything

• Lib - contains object builder and unity binaries that you can use in your application independent of EntLib

• Quick Starts - contains sample code in both C# and VB.NET that you can use to see available functionality of EntLib and how to use it in your own applications.

• Scripts - contains batch files to amongst others compile EntLib from the source, register assemblies and to install Northwind database for the quick starts

Enteprise Library 4.1 can be found http://msdn.microsoft.com/en-us/library/dd203099.aspx