This works pretty well, as far as I can tell.
Open the document in Word. Pull down File, Save as Web Page. Be sure to save it in the same place as your other local web files. Mine are in a folder named 591, as you can see below. (This is Word 2000 on a PC, but it's the same basic thing on a Macintosh.)
It may be that certain formatting instructions are not supported by web browsers. Word will try to format as well as it can. After clicking Save, you may get a window resembling this:
Click Continue and see how it works. The examples I've tried have worked fairly well. However, tables and images don't always come through in the same place you put them.
If the Word document is simple, Word will only produce a single html file. If it is more complicated, Word will produce a folder containing additional web pages or images needed in the document. This needs to be published along with the main web page.
Finally, you need to set up a link to the html that has been produced, in a web page that already exists, for example, your index.html file. Open index.html in your html composer and add a hyperlink. (This is composer-specific, but might be done by clicking an icon or pulling down a menu; in FrontPage, there is an icon that looks like a globe, or you can pull down Insert, Hyperlink, or simply type Control-K.)
Now indicate that the link should point to your html file produced from Word. Then publish your web site, which should automatically upload all the files related to your Word document.
Strangely, when I use FrontPage to edit the resulting html file, it launches Word to do the editing. I can override this with FrontPage 2000 by looking at the Folder List, right-clicking on the file, choosing Open With..., and choosing FrontPage. Note that the changes are made only to the html file, not the original Word document. Another FrontPage quirk is that it does not realize that there are new html files in the folder containing all my web files. I need to look at the Folder List (FrontPage 2000) or FrontPage Explorer (on the Mac) and pull down View or Tools, then Refresh.
Below are some examples that have worked reasonably well.
Below is an example which includes equations and pictures.
Unfortunately, the equations may look better on some browsers than on others.