Convert DOCX to DOC Free

I just received a Microsoft Word 2007 file and I'm having trouble opening the DOCX file in my Mac. I borrowed my friend's PC and he only has MS Word XP. So I searched the internet for instructions on how to convert docx to doc for free. There are a lot of resources and I was able to find a solution to my problem. The instructions are simple and easy to follow. Go ahead and try it.