In Internet Explorer "Intermediate Certification Authorities" Certificates I have the following duplicates except for date range. Issued To:MSN Content Authentication Issued By:MSN Content PCA Expiration 10/02/24 (From 05/02/24)Issued To:MSN Content Authentication Issued By:MSN Content PCA Expiration 17/02/09 (From 08/10/27) The question is why.

Certificates have a finite lifetime.The certificate was renewed, but both copies are needed to build certificate chains.Hence, both exist in the intermediate CA store.Brian