New lync 2013 , 2 subdomains ,ad one domain in foreign country

As you can see in the picture below, I have the main AD called main.prod and two child1 and child2 subdomains. What is more  I have AD called international.prod placed in foreign country.  I have mbox, cas  using child1.main.prod domain and
lync 2010  with UM funcion. The more I have 2way trust  between child2.main.prod subdomain and international.prod domain. Now what I would like to do is : make CAS in subdomain child2.main.prod which is authorising people from domain international.prod
and have mailboxes on mbox from subdomain child1.main.prod as it is shown in the picture. Do you think it make sense? Or I have to make mbox in subdomain child2.main.prod????
WHat else: I would like resign Lync 2010 and  install new  Lync 2013 and make people from subdomains: child1 and child2 and domain international.prod using this new Lync ,and move UM funcionality from old 2010 lync into new 2013.
Any contraindications, suggestions??

Lync Server supports the following topologies for Exchange UM integration:
Multiple domain (that is, a root domain with one or more child domains). Lync Server, and Microsoft Exchange servers are deployed in different domains from the domain where you create users. Exchange UM servers can be deployed in different
domains from the Lync Server pool they support.
Lisa Zheng
TechNet Community Support

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