Zamzar is a free file conversion service that supports the ability to convert a file from one format (i.e.: Microsoft Word) into a wide variety of other formats (i.e.: Adobe PDF). There are four categories of file formats that this web site supports: document, image, music and video.
All you do is upload the file, select the format you want to convert it to, enter your email address , and press the convert button. In a few minutes you should receive an email with a link to download the converted document when the process is finished.