After Writting the post

Sorry - out there- after writing the first post I realized that I didn´t mention the E-pub vs. PDF dilemma.

http://www.wikihow.com/Convert-a-Word-Document-to-Epub


If you read the link. You´ll see that both files work as in online readers of different sort. But that epub is the one that work with most. The link also mentioned Calibre with I have mentioned in the previous post.

To make epub get Calibre http://calibre-ebook.com/ You could then save the Word doc as rtf and import it into Calibre. Then you can convert it to epub. Sometimes I use Sygil to fix up the Chapter headings. http://code.google.com/p/sigil/
I am pretty sure Sygil will import html; so you instead you could save the doc as html in Word and then open in Sygil and save as epub.



EPUB (short for electronic publication; alternatively capitalized as ePub, ePUB, EPub, or epub, with "EPUB" preferred by the vendor) is a free and open e-book standard by the International Digital Publishing Forum (IDPF). Files have the extension .epub.
EPUB is designed for reflowable content, meaning that an EPUB reader can optimize text for a particular display device. EPUB also supports fixed-layout content. The format is intended as a single format that publishers and conversion houses can use in-house, as well as for distribution and sale. It supersedes the Open eBook standard.

I just added Wikis explanation of epub if you like me don´t know what epub is.


Here is an other explaination  as to the difference

daisy mina May 19, 2011
If you don’t have Ms Word 2007, you can ask for a friend of you who has one to use the “save as” function to convert word to PDF file. Usually the converted PDF file quality is gratified except for password setting feature.
For converting Word to ePub documents, I suggest you use a professional ePub Creator. Bcz it can help you to make a standard and fully ePub book publication. Apart from basic conversion from Word, PDF, image, text to ePub files, you can also design book cover and tile, layout, author, chapter…. Found here


Wiki´s Cablibre

calibre

Windows, Mac OS X, GNU/Linux

None

Primarily for library management, conversion, and transferring to devices, it includes a reader. "Calibre: About". http://calibre-ebook.com/about.