Is it possible to publish a single file based web page with TMG 2010?

Hi,

I want to publish a single web page for maintenance purposes. My TMG server publishes an internal OWA page, but I want to redirect to a maintenance page (i.e. maintenance.htm - "offline until 7am"). I've simply knocked up a single HTML page and copied on the C:\ of the server. Can I get TMG 2010 to just serve a single page or must I point at an actual web server?

Thanks

IT Support/Everything