Most converters available are a load of .... Most will not render things as you want. It is no problem creating a good ePUB from Word, I do it all the time. However, you must consider that Word is not really good in creating HTML. It makes a mess of it. Saving it as filtered HMTL makes it workable, although you still have to clean it up.
When it comes to ePUB, I would advice to make sure that you have at least some basic knowledge about XHTML and CSS, since those are the building blocks.
For creating ePUB from the building blocks, I would strongly advise Sigil. If you really want to use a converter, try Calibre. It does a reasonably job, although I think the coding of the resulting ePUB is not optimal and needs retouching.
I almost forgot. PDF is a crappy format to convert from, since it is usually not reflowable. If it is reflowable, you might get good results. In general try to stay away from PDF as intermediate format for ebooks.
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