If you ever need the other way around (two computers at home f.e. using different versions):
Microsoft Office Compatibility Pack for Word, Excel, and PowerPoint 2007 File Formats
Users of the Microsoft Office XP and 2003 programs Word, Excel, or PowerPoint-please install all High-Priority updates from Microsoft Update before downloading the Compatibility Pack.
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. For more information about the Compatibility Pack, see Knowledge Base article 924074.
Note: If you use Microsoft Word 2000 or Microsoft Word 2002 to read or write documents containing complex scripts, please see
http://support.microsoft.com/kb/925451 for information to enable Word 2007 documents to be displayed correctly in your version of Word.
http://www.microsoft.com/downloads/details.aspx?F...-8f43-c6bb74cd1466
/ 
