Certificate renewals have changed from IIS 6 to IIS 7. Specifically, IIS 7 generates a different type of certificate renewal. The way it was… IIS 6 creates a PKCS #10 type of renewal. This is essentially just a new request with the information
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Read the complete post at http://blogs.iis.net/rlucero/archive/2009/05/28/certificate-renewals-in-iis-7.aspx