Important links:

Compatability issues: Microsoft Office 2007 files are saved in a different format. The “compatibility pack” will allow computers running Office 2000, Office XP, or Office 2003 to open, edit, and save files using the new file formats of Office 2007.

The Office 2007 Compatibility Pack can be downloaded here.

Plugins: A free addin that will convert office 2007 files into PDF or XPS file format.

The plugin can be downloaded here.