I've made a modification (changed Validity Period) to a previously copied template. I've waited an appropriate amount of time for replication of the configuration partition. When I attempt to enroll in the newly modified template, the change is not seen? I've gone as far as rebooting the 2008R2 Enterprise edition Enterprise Issuing CA, and workstation. Other than replication, what are the dependencies on template changes being seen by the CA and clients? Thank you, Paul

Try to force re-enrollment. find the certificate template in certtmpl.msc, right click it and eenroll all Certificate Holders.

Sorry folks....please disregard. Found the issue, I made a change to the template against a DC in a lag site.