Here is what the Microsoft Office 2002 conversion to unfiltered HTML looks like for a simple HTML page that has only the words, "Hello, world!". The filtered HTML version is shown as well below this version. 
<html xmlns:o="urn:schemas-microsoft-com:office:office"
xmlns:w="urn:schemas-microsoft-com:office:word"
xmlns="http://www.w3.org/TR/REC-html40">

<head>
<meta http-equiv=Content-Type content="text/html; charset=windows-1252">
<meta name=ProgId content=Word.Document>
<meta name=Generator content="Microsoft Word 10">
<meta name=Originator content="Microsoft Word 10">
<link rel=File-List href="MSwordunfiltered_files/filelist.xml">
<title>Hello, world</title>
<!--[if gte mso 9]><xml>
 <o:DocumentProperties>
  <o:Author>Stephen Lang</o:Author>
  <o:LastAuthor>Stephen Lang</o:LastAuthor>
  <o:Revision>2</o:Revision>
  <o:TotalTime>2</o:TotalTime>
  <o:Created>2006-10-15T22:46:00Z</o:Created>
  <o:LastSaved>2006-10-15T22:46:00Z</o:LastSaved>
  <o:Pages>1</o:Pages>
  <o:Words>2</o:Words>
  <o:Characters>12</o:Characters>
  <o:Lines>1</o:Lines>
  <o:Paragraphs>1</o:Paragraphs>
  <o:CharactersWithSpaces>13</o:CharactersWithSpaces>
  <o:Version>10.6817</o:Version>
 </o:DocumentProperties>
</xml><![endif]--><!--[if gte mso 9]><xml>
 <w:WordDocument>
  <w:SpellingState>Clean</w:SpellingState>
  <w:GrammarState>Clean</w:GrammarState>
  <w:Compatibility>
   <w:BreakWrappedTables/>
   <w:SnapToGridInCell/>
   <w:WrapTextWithPunct/>
   <w:UseAsianBreakRules/>
  </w:Compatibility>
  <w:BrowserLevel>MicrosoftInternetExplorer4</w:BrowserLevel>
 </w:WordDocument>
</xml><![endif]-->
<style>
<!--
 /* Style Definitions */
 p.MsoNormal, li.MsoNormal, div.MsoNormal
	{mso-style-parent:"";
	margin:0in;
	margin-bottom:.0001pt;
	mso-pagination:widow-orphan;
	font-size:12.0pt;
	font-family:"Times New Roman";
	mso-fareast-font-family:"Times New Roman";}
@page Section1
	{size:8.5in 11.0in;
	margin:1.0in 1.25in 1.0in 1.25in;
	mso-header-margin:.5in;
	mso-footer-margin:.5in;
	mso-paper-source:0;}
div.Section1
	{page:Section1;}
-->
</style>
<!--[if gte mso 10]>
<style>
 /* Style Definitions */
 table.MsoNormalTable
	{mso-style-name:"Table Normal";
	mso-tstyle-rowband-size:0;
	mso-tstyle-colband-size:0;
	mso-style-noshow:yes;
	mso-style-parent:"";
	mso-padding-alt:0in 5.4pt 0in 5.4pt;
	mso-para-margin:0in;
	mso-para-margin-bottom:.0001pt;
	mso-pagination:widow-orphan;
	font-size:10.0pt;
	font-family:"Times New Roman";}
</style>
<![endif]-->
</head>

<body lang=EN-US style='tab-interval:.5in'>

<div class=Section1>

<p class=MsoNormal>Hello, world!</p>

</div>

</body>

</html>
Here is what the Microsoft Office 2002 conversion to filtered HTML looks like for a simple HTML page that has only the words, "Hello, world!". 
<html>

<head>
<meta http-equiv=Content-Type content="text/html; charset=windows-1252">
<meta name=Generator content="Microsoft Word 10 (filtered)">
<title>Hello, world</title>

<style>
<!--
 /* Style Definitions */
 p.MsoNormal, li.MsoNormal, div.MsoNormal
	{margin:0in;
	margin-bottom:.0001pt;
	font-size:12.0pt;
	font-family:"Times New Roman";}
@page Section1
	{size:8.5in 11.0in;
	margin:1.0in 1.25in 1.0in 1.25in;}
div.Section1
	{page:Section1;}
-->
</style>

</head>

<body lang=EN-US>

<div class=Section1>

<p class=MsoNormal>Hello, world!</p>

</div>

</body>

</html>