Adding Linked mailboxes to a Dynamic Distribution Group?

We have a second domain controller/ad forest that is in a two way trust relationship with our main forest.

The Exchange server is on our domain, and we have set up linked mailboxes for the AD accounts on the new forest.

When creating a dynamic distribution group, Exchange cannot see the second forest so that we can select the OU and include these users.

How would we set this up so that we can dynamically include all of these linked mailboxes in the desired recipients?

Something worth noting is that we have two mailbox databases, one for OUR user mailboxes and the other where the linked mailboxes sit.

1. Can we use a shell command to create a dynamic distribution group for all linked mailboxes?

2. Or perhaps for all mailboxes in the second database?

3. If exchange could see the other domain when we click browse to select the target container, this would also be a solution

Thanks in advance for the help!
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Jian An LimSolutions ArchitectCommented:
the short answer is no.  

You cannot map 2 different domain's as the dynamic distribution group at one time

(assumeing f1 is in one domain, and f2 is on the other domain)
DDG = dynamic distribution group
Co = contact

in order to achieve this, you need to run another dynamic distribution group DDG-F2 on the other forest, and create a contact CO-F1 to targetaddress to dynamic distribution group DDG-F2.  and add this contact CO-F1  into your current dynamic distribution group DDG-F1

Can you create a 2nd forest using the powershell (for example)

New-DynamicDistributionGroup -Name "XXX" -Alias "Pacific_Northwest" -OrganizationalUnit "F2/Users" -RecipientFilter {((RecipientType -eq 'UserMailbox') -and ((StateOrProvince -eq 'Washington' -or StateOrProvince -eq 'Oregon')))} -RecipientContainer "F2"

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