Word often can double or triple the size of an ebook. It adds a TON of stuff to the HTML that isn't needed.
When I used to do web design for my high school (about 10 years ago), we'd be given word documents all the time to put on the webpage, and we'd first export to HTML, then go through and clean the HTML up. For instance, Word would output HTML that would ordinarily be a 90kb. After going through and removing the junk that Word added, it would be 1 or 2 kb. It is still that way, despite all the improvements they've made.
I'd recommend LibreOffice (like I said, that's the new name for OpenOffice), or Sigil. Both are free, so go give them both a whirl and see which you prefer.
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