Word 2007 HTML and CSS Rendering Capabilities

I installed this program for Expression Web and have followed the directions
in part 2 of the setup instructions. As follows:

Walkthrough: Validating HTML and Cascading Style Sheet Grammar Using
Expression Web Designer 2007
1. Start Expression Web Designer 2007.
2. On the Tools menu, click Page Options.
3. On the Authoring tab, under Document Type and Secondary Schema, in the
DocType list, choose None.
4. In the Secondary Schema list, choose HTML for Word 2007.
5. Under CSS Version, in the Schema Version list, choose CSS for Word 2007,
as shown in the following figure.


I cannot find "CSS for Word" in the Schema Version List. Not sure why not
or how to find/load this schema so that it is available.
--
Brad