RTM - Microsoft Office Compatibility Pack
Microsoft Office Compatibility Pack for Word, Excel, and PowerPoint 2007 File Formats
By cliking a docx or other format file of office 2007, above versions you can use the Microsoft Office Compatibility Pack in order to read documents created in 2007 version since 97 to 2003 version without no problems. Link Bellow
Microsoft Office Compatibility Pack for Word, Excel, and PowerPoint 2007 File Formats
http://www.microsoft.com/downloads/details.aspx?familyid=941B3470-3AE9-4AEE-8F43-C6BB74CD1466&displaylang=en