“Introducing Windows Server 2008 R2" from Microsoft Press is available as a free download. Authors are Charlie Russel and Craig Zucker. 

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Download from here (PDF 11MB, 182 pages)

http://download.microsoft.com/download/5/C/0/5C0BD0AB-040D-4C56-A60B-661001012DDA/Windows_Server_2008_R2_e-book.pdf