I'm testing the style="oeb-column-number:auto" and it appears that a too large margin-left and margin-right was the culprit in not allowing those nice margins displayed in the previous post's .imp test ebooks.
I now attach a .html/.opf to create a better looking TWO-COLUMN ebook!
All you need is the <div style="oeb-column-number:auto"> html style. I don't know what it does, but appears to allow text to be split over two columns.
This may have some practical uses, once it's better understood!
See this thread entitled "Easily create two column (newspaper-style) ebooks" for an example how to use this style in ebooks!
Oh, by the way, the attached .zip contains the 'images' that were converted by word2imp.pl to .wmf format and referenced in the .html. The only problem is that .wmf is NOT supported by eBook Publisher, so I used the generated fallbacks .jpg and copied them over the .wmf pictures (I had to change the .jpg to .wmf!)