As more and more users are switching to the latest version of Microsoft Word, Excel, and PowerPoint 2007, users are facing trouble using these new formats in older versions of office but their's a solution provided by Microsoft as Microsoft Office Compatibility Pack, installing this 28 Mb update will enable earlier versions of the Microsoft Office to open, edit and save files in the latest format of the software.
By installing the Compatibility Pack in addition to Microsoft Office 2000, Office XP, or Office 2003, you will be able to 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.
Download Office Compatibility Pack
The direct download link was removed due to a DMCA copyright violation notice from Microsoft, however you can still download "FileFormatConverters.exe" from the official link here - http://www.microsoft.com/downloads/details.aspx?FamilyId=941b3470-3ae9-4aee-8f43-c6bb74cd1466 0r search Google for "FileFormatConverters.exe".