How to open Microsoft Office 2007 .docx files on Microsoft Office 2000, Office XP, or Office 2003? Unlike previous releases, Office 2007 comes bundled with newer technology that is not compatible with previous generation of Microsoft Office. With the Microsoft Office Compatibility Pack for Word, Excel, and PowerPoint File Formats, you are now able to open, edit, and save documents, workbooks, and presentations in the new file formats new for Microsoft Office Word, Excel, and PowerPoint 2007.
By installing the Compatibility Pack in addition to Microsoft Office 2000, Office XP, or Office 2003, you will be able to open, edit, and save files using the file formats new to Word, Excel, and PowerPoint 2007. The Compatibility Pack can also be used in conjunction with the Microsoft Office Word Viewer 2003, Excel Viewer 2003, and PowerPoint Viewer 2003 to view files saved in these new formats.
Recommended Reading: Convert Adobe PDF File to Microsoft Office Word DocX Online