Issue: The certificate in use on your Exchange 2003 server has expired and needs to be renewed or replaced.
Background: Exchange 2003 running on Windows 2003 uses IIS 6.0, therefore the certificate is tied to the Default Website in IIS and can be renewed/replaced using IIS Manager. SSL certificates are used to encrypt http sessions allowing you to run encrypted Outlook Web Access and Activesync sessions over port 443 (HTTPS).
In order to use a certificate that will be recognized by browsers and mobile devices you will need to purchase a certificate from a recognized third party certificate authority like GoDaddy, or checkout my guide on buying a cheap ssl certificate.
Select Renew the current certificate:
Select “Prepare the request now, but send it later” and click Next.
Enter the path and filename for your certificate request file, this file will be submitted to your Certificate Authority like GoDaddy, NameCheap, etc.
Click Finish to complete the IIS 6 Web Server Certificate Wizard.
Obtain certificate from third party CA:
Next you will need to submit the CSR (certificate request) to your third party Certificate Authority (NameCheap, etc, etc). After submitting the CSR and completing the verification steps of your Cert Authority you will download your completed ssl certificate file from your Cert Authority and use it to process the pending certificate request and install the certificate (click link for steps).
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