My wife had a job application form sent to her in .DocX – *X is the new file format for Windows 7 and IS NOT Backwards compatable (thanks MS!)
So some advice (after an hour sodding about trying to read the forms). IGNORE the programmes you found on Google that say they will convert. They are all limited versions, and if you want more than 1 page you have to pay upwards of $20 for the licence.
INSTEAD MS site has a update that makes old versions of Word ‘Forward Compatable’ – CLICK HERE
Now when you are emailed something with a docX file save it without trying to open it (a folder you can find easily)
Now when you use OPEN in your older version of Word navigate to where you saved the download, set the file type to All Files (so that the docx shows up), and double click on the DocX documents. You can then resave as a normal Word Document (make sure you set the type before saving)