Most of you must be coming across the problem of been unable to open Microsoft Office Word, Excel, PowerPoint 2007 file in your older version of Microsoft Office 2000, Office 2003 or Office XP. You must be having ample of information which might not open in the older versions of Microsoft Office. Here is the solution to your problem.
Microsoft Office 2007 Compatibility Pack

There is a Microsoft Office Compatibility Pack for Word, Excel, and PowerPoint 2007 File Formats which can be carried on your usb pen drive which comes handy for quick installation.

By downloading the Microsoft Office Compatibility Pack (27.5 MB) you can open, edit, and save documents, workbooks, and presentations in the file formats new to Microsoft Office Word, Excel, and PowerPoint 2007.

With the installing of the Compatibility Pack, you can easily use Microsoft Office 2000, Office XP, or Office 2003, to open, edit, and save files using the file formats new to Word, Excel, and PowerPoint 2007. This also works with Microsoft Office Word Viewer 2003, Excel Viewer 2003, and PowerPoint Viewer 2003 so that files saved in these new formats can be viewed.

Whenever you open an Office 2007 document in Office 2003, you may come across the following alert. The document opens but some styling is loss.

Why is it that the new Office 2007 programs fail to open in older versions?
Microsoft has added new Office Open XML Formats to Microsoft Office Excel 2007, PowerPoint 2007 and Word 2007. The new formats is helped by improving file and data management, reducing file sizes, and improving recovery of damaged files. A ZIP compression technology is used by Office XML Formats to store documents.