Question : How to configure IIS/DNS to redirect to OWA virtual directory

My company is running Win2K3 with Exchange 2003 installed.  This machine is also hosting our certificate services for exchange/https mail download.  OWA is also running on this machine as well.

Basically when users go to access OWA from the web they have to type in https://servername1.companyname.com/exchange.  I want to shorten this down to just https://mail.companyname.com.  My ISP DNS is setup with a single A record for 'servername' pointing to my external IP.  

Can anyone tell me what the easiest way to accomplish this is without any disruptions or downtime?

Answer : How to configure IIS/DNS to redirect to OWA virtual directory

This is how I do it:
http://www.amset.info/exchange/owa-defaultpage.asp

Doesn't matter how the server is referenced, so it could be http://server or http://192.168.1.1/ or https://something.example.com/ it will redirect to the /exchange virtual directory.

Simon.