Recently I have got a job in good company. This company has provided me laptop for office work. This is good configuration laptop. It supports all most all application. But in this laptop Microsoft office 2010 is install. I donít know much more about the Microsoft office 2010. I use to Microsoft office 2007. Because I installed office 2007 in my laptop. I prepare the workbook in excel 2010 because I am in office. When I return at home then open this file in office 2007. How to data validate on the office 2007. Because laptop is not permission to bring at home from office. When I save the book in 2010 and opened in 2007, data validation has completely disappeared. If I save the book in 2007 and opened in 2010, data validation is intact.