Just finished migrating from 2007 to 2013 and decommissioned 2007. Exchange 2013 is running in site A with 350 mailboxes on it. However, almost half of those users reside in site B so the plan is to introduce a second Exchange 2013 server to this site and migrating mailboxes to it. There already exists a DC & GC in both sites.
My question is, immediately after I introduce Exchange 2013 into site B with CAS & MBX role, client computers from that site will start to receive certificate errors. Will updating the SCP on the new exchange server to point to the SCP on the exchange server in site A be enough to mitigate that problem? What other precautions will I need to take? Has anybody been down this road?