One of the coolest new features of Windows Server 2008 R2 is the Active Directory Recycle Bin.  I recorded a quick video about why this is such a cool improvement, and also demonstrate some of the basics of setup and how to use it. I have included links to the source documentation on TechNet at the end of the post. 

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For more information on the Active directory recycle bin please read the following.

http://technet.microsoft.com/en-us/library/dd392261(WS.10).aspx