Customize the Document Map Style
The Problem:
The Document Map is greatexcept that its font is far too small. I'm going to go blind peering at it. I've tried to customize it, but it doesn't even appear in the "All styles" category in the Styles and Formatting task pane. My friend who has Word 2000 tells me the style is called (logically enough) "Document Map." I've tried creating a new style with that name, but Word tells me the name is reserved for a built-in style.
The Solution:
In Word 2000, you can simply choose Format 
Style to display the Style dialog box, choose "All styles" in the List drop-down list, select Document Map in the Styles list, and click the Modify button to modify the style.
Word 2003 and Word XP hide the Document Map style and some other built-in styles from you. To force Word to display the Document Map style:
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Choose Format
Styles and Formatting. In the Styles and Formatting task pane, choose Custom in the Show drop-down list to display the Format Settings dialog box. -
In the "Styles to be visible" list, check the Document Map box, and then click the OK button.
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Back in the Styles and Formatting task pane, click the Document Map style, click its drop-down arrow, and choose Modify from the pop-up menu to display the Modify Style dialog box.
Once you've opened the Modify Style dialog box, use its controls to modify the style. Check the "Add to template" box to make sure your changes are saved to the template.