Het is mogelijk met de FileFormatConverters van Microsoft. De FileFormatConverters vindt je in de Microsoft Office Compatibility Pack.
Download de Microsoft Office Compatibility Pack for Word, Excel en PowerPoint File Formats hier: www.microsoft.com
By installing the Compatibility Pack in addition to Microsoft Office 2000, Office XP, or Office 2003, you will be able open, edit, and save files using the file formats new to Word, Excel, and PowerPoint 2007. The Compatibility Pack can also be used in conjunction with the Microsoft Office Word Viewer 2003, Excel Viewer 2003, and PowerPoint Viewer 2003 to view files saved in these new formats
Voor meer informatie zie KB924074
ICT-Freak.nl 
The better solution is not to use Office 2007 or the compatibility pack. OOXML (docx format) conflicts with established open standards. OOXML does not address anything that has not been addressed previously. Further, read the code (as I have had the chance to do) and you will find the output unrecognizable compared to ODF. Sorry to rant, but the compatibility pack just reset / broke several parts of Excel, that I have to use for a project, including the ability to use the arrow keys to move between cells and the F7 key response. I should not have to go through and reset variables I never touched before.