It does exactly what you asked for:
<html>
<head>
<title>100% height</title>
</head>
<body style="margin-top: 0%; margin-left: 0%; margin-right: 0%; margin-bottom: 0%;">
<table border="0" cellpadding="0" cellspacing="0" width="100%" style="height: 100%;" bgcolor="#FF0000">
<tr>
<td>
</td>
</tr>
</table>
</body>
</html>
Will produce a table at 100% width and 100% height