Here is one article that explains one possible way. It is written for OWA,
"Uday" <Uday@discussions.microsoft.com> wrote in message
news:51E64ECD-7907-47C4-BAB4-11F8CD57A4BB@microsoft.com...
> Hi,
>
> I have to enable the site for SSL. I have installed the certificate and
> can
> enable the site using SSL from Directory Security etc.
>
> But users will be visiting the main page under
http://www.abc.com > and I want to redirect them to
https://www.abc.com >
> Where do I configure the autoredirect? I believe it should be somewhere
> in
> IIS and not in application. We are running IIS 5.0 with W2K server.
>
> Thanks,