change exchange 2003 server certificate

I have an exchange with a server certificate on mail.mydomain.com but this url was replaced by mail.dnsalias.org.
When I look in the default web site properties I can't choose 'replace the current certificate'.
Can anyone tell me how I can change this certificate?
vincent-ICMAsked:
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Alan HardistyCo-OwnerCommented:
As you have SBS - simply re-run the Connect to The Internet Wizard (Start> Server Management> To-Do List> Connect To The Internet) and change nothing until you get to the certificate part, at which point you simply choose to setup a new certificate and name it mail.dnsalias.org and then complete the wizard.

Job Done.
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