An interesting post made by Abhishek Kant, regarding How to open MS Office 2007 file without installing Office 2007 on your computer.
if you don't have Office 2007 and have started to receive docx files from
individuals, you can now read the same using the newly released Word Viewer
2007.. the word viewer replaces all earlier releases... true to its
name, the viewer let's you view the Word documents but don't let you edit
the same... the Word Viewer enables free viewing of .docx and .docm with the
same visual fidelity as the full version of Word 2003.
Get the FREE download here