(This post is for you, Tessa!)
I was talking with a resume writing colleague today, and she suggested I write an article in Resume Writers' Digest about the new version of Microsoft Word (Word 2007) that creates the .docx files. Specifically, she was wondering if there was a converter for the Macintosh that would allow you to open the files. The answer is yes!
With the Office Open XML Converter, you can convert Office Open XML files to a format that is compatible with Microsoft Office 2004 for Mac and Microsoft Office v. X for Mac. You can choose to convert and open one file, or convert a large number of files. You might lose some data, but it's better than not being able to open the files at all.
Also, this is a beta release, and will expire Dec. 31, 2007, but Microsoft is expected to issue a permanent solution early in 2008.
If you are using a PC, you can download the Word Compatibility Pack to convert the files to be opened in an earlier version of Word.