I'm currently in the process of merging users from 1 domain to another. I want to make this as simple as possible, since it's a limited amount of people(20 users) I'm just going to backup email to a .pst file. Then add there domain name as an accepted domain in our Exchange 2013 Server. Aside from the internal/external routing is there anything else I need to do? Would I have to add there domain name to our certificate?
Thanks