Making domain name resolve to /exchange

You could create a subdomain, then configure your http server to foward that to any URL you like with either a virtual directory or just an http file.

So: www.abc.com/exchange
becomes: exchange.abc.com (with a virtual server pointing to the subfolder)

Under the properties of the default web site on the Home Directoy tab could i get away with choosing a redirection to a url and point it to https://abc.com/exchange ? we are not running a web site off the SBS box

That's the default setting and should already work like that.  You could even use your static outside ip address like:
http://68.56.32.20/exchange
and it should take you to your Exchange website.
Does this not currently work?

I was under the assumption you wanted to get rid of typing in the "/exchange" at the end of the domain name and thus resolve it to its own domain name.

You are correct in your assumtion. I was refering in the properties for the default web site in IIS. Replacing inetpub/wwwroot with the www.abc.com/exchange for the home directory.

Im trying to get abc.com to replace abc.com/exchange


It didnt work like that though.