When you install a web app, it often times installs to a virtual directory, which means that instead of browsing to http://server, you have to browse to http://server/app. It used to be that I would simply setup a META redirect in the default.html page to redirect the browser, I learned today that isnt the optimal method, nor does it always work.
As I was setting up a redirect for a site, I found that some browsers worked and some didnt. Also, the security settings appear to impact the types of redirections (relative or absolute) that are allowed. A little googling and I found http://exchange.mvps.org/owaredirect_frames.htm. This is for IIS5/6, and it is a little easier in IIS7.
Gratuitously copied and pasted below in case the content gets retired.
How do I redirect the default web site to /exchange ?
b) Type /exchange in the text box
c) Check the “directory under this one” radio button