Thread:Project:Support desk/Make Special:Categories the main page?

I'm using: MediaWiki 1.18.1; PHP 5.3.8 (apache2handler); MySQL 5.5.16-log. My wiki is behind a corporate firewall so you will not be able to view it.

I would like to make Special:Categories the wiki main page. I thought I could do this by transclusion, but it doesn't seem to work. I can transclude but not. Is there a way to accomplish what I want?