As my new Lync Online book has been published I am open sourcing the superseded Wave 14 version, which is still of value in many respects, however it will now be free to download in PDF, ePub and MOBI formats.
You will find this book on either:
http://www.ciaops.com/downloads/
or
http://www.ciaops.com/publications/
Wave 14 Lync Online eBook free to download
Published
CIAOPS 