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Exchange 2010 - external domain trust

Hello All;

I'm kidding banging my head with this one and need some insight.  There is a two way trust between DomainA & DomainB

DomainA
Exchange 2010
server 2008

DomainB
server 2012R2

We have external users on DomainB that was primarily used for sharepoint authentication through the domain trusts.  
Now there is a SMTP requirement to have users in DomainB be notified for custom sharepoint tasks.
I wanted to create Mail Users & add existing users within Exchange 2010 for those users but Exchange only sees the Organizational Unit for DomainA.  

Domain A
Exchange 2010


Domain B
USERS (Need to Add Existing Users SMTP addresses).

Hope I didn't lose you and thank you for any insight.
ASKER CERTIFIED SOLUTION
Avatar of Will Szymkowski
Will Szymkowski
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