With the release of Office 2008 for the Mac and (I think) 2007 on the PC Microsoft introduced the .docx file type. I have no problem with it, but I no longer use Office only Google Docs. The problem is that from what I can tell Google Docs will not import .docx files ... when I get one via email I am out of luck. But a couple of links emerged today ... the first is the utility that Microsoft itself provides to change the file types. Simple application that is downloadable from the Microsoft site. The second, and I haven't tried this one yet, is a site called Zamzar. It looks promising, allowing you to convert files into dozens of formats via the web. So the next time you get a .docx and need to work with it, there are option.