Many wonder how to convert Office files ( word, excel, powerpoint etc .. ) to PDF , and if you do some google search you will find out that there are many many tools to do that, including printer drivers (pdf printer drivers) and all types of upload to website to convert, and shareware, and in the end many will require money payments even for micropayments, one should wonder why would he pay when its legally free and available from Microsoft website itself !
The PDF Addin,
http://www.microsoft.com/downloads/details.aspx?FamilyID=f1fc413c-6d89-4f15-991b-63b07ba5f2e5&displaylang=en
And direct download link is here
This adds a simple Save as PDF to all your office 2007 engine 
This applies, when all you need is to save your files as PDF !
Grats , you’re done !