I am have a query...

If the name of the destination server (Win2008) is different from the source server(Win2003). And later we decide to decommission the server(Win2003). What effect will be on the Certificate that are already issued from the source server(Win2003).
1. Can we renew those certificates from the Windows 2008 server ?Since we have restored the CA database and private key on the Windows 2008 server.
2. What could be the impact if we shutdown the Windows2003 after migration. Please note CA server of windows 2008 have a different hostname now.
3. What are the impact to the existing servers where the cert is pointing to the Windows 2003 CA server.
I followed this article to do the CA migration
AD CS Migration: Migrating the Certification Authority