As quoted in a Columbia Daily Tribune follow-up article about PDF creation, Delta Systems was sited as the source of the following information:
PDF creation is now fully supported in Microsoft Office 2007, installed as one of those free add-ins that many users don’t even know exist. Luckily, Microsoft provides links within Office to download add-ins. To download this Office 2007 add-in, Google these words – “download Office 2007 PDF add-in” – and it should be one of the first links you see, from www.microsoft.com.
The specific file that the author alluded to is the Save as PDF Extension
Of additional note, and while you’re updating Office 2007, you’ll want to grab these updates too:
Making Office 2007 Documents Viewable In Previous Versions of Office
What is .docx, .xlsx and .pptx? How do I open Office 2007 documents in Office 2003?