How to get a trust between domain controllers?

Hi,

The situation is that i have 2 domain controllers, one is Exchange (exc.local) and the other one is RDS (rds.local) On the RDS farm i want to get the the user information of the Exchange domain controller. Because other wise they needed two passwords, one for RDS and one different for their e-mail account.

So i have user test.user@domain.com on the exchange domain controller and also the "same" user on the RDS domain controller. Is it possible to connect between both? Or does someone has a other solution?

RDS information
Server 2012 R2

Exchange information
Server 2008 R2

Thanks.
Thomas
GeneITSolutionsAsked:
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yo_beeDirector of Information TechnologyCommented:
Here is a MS tech article that will outline it all.
It does describe it for 2003, but nothing has changed for either 2008 or 2012

 https://technet.microsoft.com/en-us/library/cc778851(v=ws.10).aspx

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yo_beeDirector of Information TechnologyCommented:
Is there a reason you created this second domain rather than just adding a member RDS server to your environment?
GeneITSolutionsAuthor Commented:
Yes we created the exc.local domain a long time ago, and that domain is configured with an external subnet and not an internal one. After a lot of improvement changes in our network, we decide to add the RDS with the second domain controller behind the firewall.

We are thinking about to migrate Exchange 2010 to Exchange 2013 and in that point also migrating the domains. But i will test the trust between each other.

I will get back in a few days with the answer if we have some luck :). Thanks
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