Having Problems opening a Microsoft Ofice Word 2007 Docx File in an Earlier Version of Office? To open Microsoft Office Word 2007 .docx or .docm files with Microsoft Office Word 2003, Word 2002, or Word 2000, you need to install the Microsoft Office Compatibility Pack for 2007 Office Word, Excel and PowerPoint File Formats and any necessary Office updates. By using the Compatibility Pack for the 2007 Office system, you can open, edit some items, and save Office Word 2007 documents in previous versions of Word.http://office.microsoft.com/en-us/word/ha100444731033.aspx

To open Microsoft Office Word 2007 .docx or .docm files with Microsoft Office Word 2003, Word 2002, or Word 2000, you need to install the Microsoft Office Compatibility Pack for 2007 Office Word, Excel and PowerPoint File Formats and any necessary Office updates. By using the Compatibility Pack for the 2007 Office system, you can open, edit some items, and save Office Word 2007 documents in previous versions of Word.

http://office.microsoft.com/en-us/word/ha100444731033.aspx