Whenever you want to open Microsoft Office 2007 documents like .docx, .xlsx or .pptx in Microsoft Office 2003 then there is a compatibility issue occurs, which doesn’t allow user to do that action. So, to resolve this compatibility issue Microsoft has released Microsoft Office Compatibility Pack. Just follow these steps to get this pack.

Download Microsoft Office Compatibility Pack for Word, Excel, and PowerPoint 2007 File Formats

• Download Office compatibility pack from above link
• Save, run the setup and follow the instructions

Now, you can open Word (.docx), Excel (.xlsx), Power Point (pptx) documents of Office 2007 in Office 2003.