You don't need to have word 2010 or higher to save your
word document  into PDF or you don't need to install a PDF Plug-in in your Office 2007 to convert word document into PDF, you can do it simply by these few steps below.
Steps
  •       Click on Office button as it seems below
convert Word document into PDF in word 2007

  •       Go to print then print as it seen below
convert Word document into PDF in word 2007
Add caption

  •       Click print
  •        Select any PDF Printer found on List and then click OK
convert Word document into PDF in word 2007


Finally you select where you want to save your PDF document in your computer