Not if you choose "simplified HTML" as output in MS Word. I was shocked to find out how clean *that* HTML was; it almost passes W3C's validator check (in fact, passes it entirely after you manually adjust 2 or 3 details in the output).
Not sure what you are doing but my 2010 version of MS Word doesn't have a "simplified HTML" output, what it does have is a "filtered" HTML output is that what you mean? What I find in winword is: I take an existing "clean" HTML document, and open it in winword. I touch *nothing* I now save that document using 'Save As "Filtered HTML"' I open the resulting HTML in a text editor, and what I see is: * Winword has totally thrown away my style definitions. * Winword has totally thrown away all my class markings. * Winword has gratuitously marked "everything" with its "class=MsoNormal" class instead -- and then put in inline style markings everywhere in place of what were previously "reasonable" class definitions. * WInword has gratuitously wrapped "everything" inside its "<span lang=EN>" markings -- To which I say "yuck!" -- OO does much better than this. Or have you figured out some better way to use winword on HTML ?