Exchange 2013 remote site, password sync
I have site A with the domain blah.local, this site has Exchange 2013 installed. I have a remote site B with the domain blahblah.local both of these domains are 2012 function level. Site A is the parent company of site B and would like to "host" the email for site B. I want site B's Exchange email to use the same password they use when logging into their workstations at site B. No other access is needed between the two sites. I can create a VPN tunnel between the two sites. Is a transitive 1-way trust the best way to set this up? Once I setup the trust then can create a mailbox linked to the AD account in the domain blahblah.local at site B? As I mentioned I really only need the passwords sync'ed and I want to keep this as secure as possible. Any thoughts or ideas or better way to do this?
April 23rd, 2015 9:57pm

Hello.
You need to use the FIM 2010 R2 (only support Exchange 2013 and Windows 2012) for synchronizing accounts in t
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April 23rd, 2015 11:37pm

Hi damadhatter,

Thank you for your question.

Is a transitive 1-way trust the best way to set this up? Once I setup the trust then can create a mailbox linked to the AD account in the domain blahblah.local at site B?

A: yes, we need to setup the trust on two site for link mailbox and FIM.

The synchronization service was included on Forefront Identity Manager(FIM),  we could refer to the following link:

http://blogs.technet.com/b/server-cloud/archive/2012/06/14/forefront-identity-manager-2010-r2-now-available.aspx

The more details could be referred by the following link:

https://technet.microsoft.com/en-us/library/jj134310(v=ws.10).aspx

If there are any questions regarding this issue, please be free to let me know. 

Best Regard,

Jim

April 24th, 2015 3:58am

So I have to use FIM to accomplish this? A simple trust would not work? I don't want to have accounts in both domains, I was hoping to attach the mailbox to the users account in site B under the domain blahblah.local  is that not possible? 
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April 24th, 2015 4:44pm

Pretty sure I found the answer to my question. Linked mailboxes, no need for FIM.

https://technet.microsoft.com/en-us/library/jj673532(v=exchg.150).aspx

April 25th, 2015 3:19am

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