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If you need to convert Word 2007 to Word 2003 because you are unable to open a document someone sent you, you can download the Office 2007 Compatibility Pack from the Microsoft Download Center. By downloading this application, you will be able to open, edit and save not only Word 2007 documents but also Excel 2007 worksheets and PowerPoint 2007 presentations using Office 2003 versions of those programs.
It is important to note, however, that there may be some limitations using this method. For instance, you will not be able to open templates created in Word 2007 unless they were saved as Word 2003 templates. In addition, macros will be removed, mail merge data will be lost and even if you know the password of a password-protected file, you will not be able to open it. There are other drawbacks as well. Certain items made using features that are new to Word 2007 may be unalterable.Therefore, if you require complete access to the document, a better option might be to ask the creator to convert the file for you.