I had to renew an expired self signed SSL certificate that i have on Exchange 2007 box today, and found the SSL clone trick interesting and did the job for me. So here’s the howto:
Using the Exchange Management Shell run the following commands:
Get-ExchangeCertificate -DomainName server.yourdomain.com (copy the thumbprint of the expired SSL)
Get-ExchangeCertificate -Thumbprint <old thumbprint> | New-ExchangeCertificate
Now you can go to IIS and select your new created SSL certificate (this SSL have the same name as the old SSL one)
You might need to reboot IIS or any other service you enabled this SSL for.