My Firm is in the process of Migrating to Exchange 2013.
Among the several questions I have I will start with the simplest that I have.
I have a 2007 Exchange Environment in place, 2 HUB/CAS all Traffic goes to NLB NIC on CAS Servers.
I have 2x 2013 Cas Server also with an NLB nic and for now one MBX/HUB Server, no users have been migrated yet so everyone is still in the 2007 Exch Environment.
Digi Cert is in, Autodiscover,OWA have been configured to match whats on the 2007 CAS Servers.
I just needed to know what needs to be done to the 2013 CAS servers so once I route all mail to the NLB NIC it routes properly From 2013 CAS > 2007 CAS/HUB > 2007 MBX.
This is where I am getting stuck.