Martin, I'm by no means an expert, or even proficient, but I've had pretty good luck using Calibre on the Mac. I usually convert to epub, and then use Sigil to tweak the book and TOC the way I like them. Once that is done, the conversion from epub to mobi is usually perfect (at least to my eyes)
I'm sure more experienced people will be along in a bit, but if you'd like me to have a look at your Word doc/html, I'd be willing to try to help.
Tracey
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