As a new feature in Microsoft Office 2010, you can easily convert your document to a PDF from any Office program (Word, Excel, and PowerPoint). In previous versions of MS Office, you needed to have additional software installed to create a PDF. Now when you save your document, PDF is among the file types to choose from:
The PDF format is useful for sharing documents because all of the formatting is preserved and the file is protected from further editing. Remember to keep your original Word document if you will need to edit it later.