http://docx-converter.com is a website that offers for free a portable solution for your compatibility needs. In Office 2007 Microsoft introduced a new file format called the Microsoft Open Office XML Format (.docx). This format is not compatible with older versions of Microsoft Word or with alternative operating systems like Linux or Mac OS X. Nor is it compatible with other word processing applications like OpenOffice, Lotus 123, or NeoOffice.

Docx-converter.com corrects this by converting a Microsoft Office .docx file into a simple html file. It strips out some of the formatting, but now supports bold, italic, and underlined text among others.