How do I convert a .docx file on a Mac OS X
By default, Office 2007 saves documents in a new XML format (.docx). Please follow the link below to download a widget that allows users to convert files straight from the MAC OS X desktop.
Have fun!
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For best compatibility across versions of Microsoft Office, it is best to change the default file format to NOT save as Office XML.
Microsoft’s official converter from pre-MacOffice 2008 versions is Open XML File Format Converter for Mac :
http://go.microsoft.com/fwlink/?LinkId=164915