Orgs in a Forest 2010 environment. adding 2016 to sub domain.

We currently have 2010 (latest SP and roll ups)  we are expanding world wide and have created sub domains to handle India and Europe.

Company.com
- India.company.com
- EU.company.com

My question is, if I am installing 2016 in our India site, will Exchange automatically join the current org in the parent domain?  or will it want to create a new org?

then if it is a new org,  is there a way to have all of my users go to a single URL for OWA and be redirected?  

- Thanks in advance.
cdshreveAsked:
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Adam BrownSr Solutions ArchitectCommented:
Exchange 2007 and later only allows a single exchange organization per AD Forest, so if your expanded regions are added as sub-domains, they will automatically be part of the same Exchange organization. You would create the mailboxes for those users in your root forest, or add Exchange servers to the child domains, which would hold the mailboxes, but still be part of your main Exchange organization.
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cdshreveAuthor Commented:
That is what I was getting from reading but wanted to be sure.  Thanks!!
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