Microsoft Office 2007applications allow you to save all of your documents in formats compatible with older versions of Office, such as Word 2003.
The default file formats (.docx, .xlsx, .mdbx, and .pptx) for Office 2007 files are incompatible with older versions of Office, including Windows Office 2003 and Office 2004 for Mac. To save your document in a format that is compatible with previous version of Office, click on the Office button, navigate to Save As, and select Word 97-2003 Document. (Or Excel or PowerPoint.)

To always save your documents is the compatible format, click the Office button and click on Word Options at the bottom the screen. Then, select Save, and click the down-arrow next to Save files in this format, and select Word 97-2003 Docuemnt (*.doc), and click OK.
If you have questions:
Contact Dave Diedriech, Technical Training Coordinator, Instructional & Learning Services
ddiedriech@depauw.edu, x6442