Not to nit pick, but PDF stands for "Portable Document File". PDF files are "portable", ie. they can be read on any computer platform or operating system.
BTW, there is a terrific suite of applications that contains all of the functions in Microsoft Office, and its FREE. Yes, free. No strings. Get it at www.openoffice.org
With it, you can edit, import and export files created in just about any program you can imagine, including PDF files.