Client has a single-label domain with some problems, and has elected to migrate everything to a new "company.local" AD domain. External domain name will remain the same.
First phase is migrate from old EX2013 to new EX2013. New domain and EX2013 set up and working, bidirectional forest trust and cross-forest DNS is working. Users and computers will remain logged on to old domain/forest until a later phase, after Exchange is migrated. So initially, it will be an account forest/resource forest architecture. Later, servers, workstations and users will migrate to the new domain via ADMT, after which the old domain will go away.
I can find lots of instructions on the web for migrating downlevel Exchange cross-forest to EX2013, but have not found any documentation for EX2013 to EX2013 cross-forest.
Any suggestions? Or failing that, if I follow EX2010 to Ex2013 cross-forest migration instructions, and either use EMS, or mentally "translate" EX2010 EMC instructions to EX2013 EAC, will that work?