1. Open Internet Services Manager from your Administrative
Tools.
2. Open the Properties for the Web Site that is hosting
OWA (normally the Default Web Site).
3. Select the "Directory Security"
tab and then click on the "Server Certificates"
button.
4. You will now be presented with the "Pending
Certificate Request" dialogue box (below),
select - -
"Process the pending request and install the
certificate", click Next.

5. The "Process a Pending Request"
dialogue box will appear (below), navigate to the site ------------
certificatethat you received. click Next.

6. You will now be presented with the "Certificate
Summary" (below), click Next.

7. Next you will need to install the intermediate
certificate, please follow the instructions at: --------------
http://www.austdomains.com/sslcertificates_help/install_crs_iis5.htm
You have now installed the SSL certificate
into our web site, the next step is to enable SSL for OWA
- this is a pretty simple task.
1. Using the Internet Services Manager, open
the properties for the "Exchange"
virtual directory.

2. Select the "Directory Security"
tab and the click on the "Edit"
button in the Secure - -
- -
- -
- -
- -
-Communication section.
3. In the "Secure Communications"
dialogue box (below), check the box "Require
Secure --- --Channel-(SSL)",
you could also check the box "Require 128-bit
encryption", if you do check ----
the 128-bit checkbox, any browsers that do not support 128-bit
encryption will be unable to ---------
- -connect
to OWA.

When users enter http://ahost.adomain.com/exchange,
they will receive an "HTTP 403.4 - Forbidden:
SSL required Internet Information Services"
error message, because OWA is configured to require SSL.
SSL uses the HTTPS protocol, so users would need to enter
the url as https://ahost.adomain.com/exchange. Please see
the Microsoft article regarding forcing the use of SSL with
OWA: http://support.microsoft.com/search/preview.aspx?scid=kb;en-us;Q279681
One final step that you may need to take is
to ensure that your Firewall is configured to allow HTTPS
(port 443 by default) to pass through.