Do you have a DOCX file that you can't open because you don't have Microsoft Word 2007? If you only have MS Word 2003, MS Word XP or MS Word 2000, then you need to convert DOCX to DOC first. There are many solutions to this problem, and it is really easy to convert DOCX files so you can open it in other word processing softwares such as Open Office and Star Office. You can event convert it to RTF or Rich Text Format so you can open it in a Mac.
I am writing this because I want to help a friend who is having trouble opening DOCX files. He does not know how to do this before but I think he now knows how to do it. If you have the same problem, then just read this article on How To Convert DOCX to DOC tutorial. Good luck.