Portable Document Format (PDF) preserves document formatting and enables file sharing.
If you want to make changes to the PDF after saving it, return to your original 2007 Microsoft Office system file in which you created it and save the file as a PDF again.
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You can use the Office programs to save or convert your files to PDFs so that you can share them or print them using commercial printers. Use PDF format when you want a file that: Open and browse to the PDF file. You can copy any content you want from it, including images and diagrams.
The PDF format is also useful for documents that will be reproduced using commercial printing methods.
PDF is accepted as a valid format by many agencies and organizations, and viewers are available on a wider variety of platforms than XPS.