For over 11 years Jan Zitniak has been a professional instructor concentrating on Microsoft Office. He holds an international Microsoft Excel – Office Excel ® 2010 Expert certificate and has written several books discussing Microsoft Office.
The information mentioned in the books comes from practical experience he obtained at such large companies as T-Systems, BSH Bosch and Siemens, Veolia, Magneti Marelli, Coavis, National Bank of Slovakia and many others.
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