Last December there was a bit of ruckus regarding Office for Mac's inability to work with Office 2007's new XML-based document formats. While the promised Office for Mac-integrated converters have yet to arrive (6-8 more weeks), Microsoft's Mac Business Unit has released a standalone converter application that provides read-only access to Office Open XML files and converts Word documents to RTF.
Office for Mac Open XML Converter Released
May 15, 2007