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Users from child domain cannot see users from their own child domain in the GAB

Hello everyone, I have two domains in same forest, parent and child. My environment is Server 2003, Exchange 2007. There is a DC/DNS in both parent and child domains. When users log on to the child domain, they can see users from the parent domain in the GAB, but, oddly, cannot see users from their own child domain. Users from the parent domain can see users from both. When creating an email from child domain, only if advanced search is used, will the sender be able to find the users email address from the child domain.

In parent domain there are 1-DC/DNS,  2-CAS/HT Mail servers, 1-MB standalone mail server, and a 2 node exchange cluster. In the child domain, there are 1 CAS/HT/MB mail server, and of course, 1- DC/DNS.

Recap:

Users from parent domain are able to see users from both parent and child domains.

Users from child domain CANNOT see users from their own child domain in the GAB, however, they are able to see users from the parent domain

Legend: CAS- Client Access server
HT- Hub Transport
MB- Mailbox
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xzay1967
Asked:
xzay1967
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2 Solutions
 
e_aravindCommented:
Just a quick question:
GAB --> Global address book, correct?

> When we have the Outlook in Online mode and OWA...do we have all the names appearing in the GAL?
if yes, then should we concentrate @ the OAB issue?
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xzay1967Author Commented:
Yes GAB is as you specified. What I was able to figure out is that when outlook in not in exchanged cached mode, all the names appear in the GAB. Once the check box for cached mode is put back, the names disappear. I will wait and see if may be more time is needed for domain replication to complete.
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NenadicCommented:
OK, it appears you have a problem with your Offline Address Book. Can you run Get-OfflineAddressBook | fl and paste the output here, please.
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e_aravindCommented:
On the Exchange server, we should have couple of folders
MBX --> \mailbox\xxx\oab\xxxx --> lots of files + oab.xml
cas --> \clientaccess\oab\GUID folder\--> lots of files + oab.xml

Compare the generation-date for these files @ the parent\child domain-servers.
if there is a lag in these folders....need to ensure the replication

> Check the "Generation Server" @ the OAB
(Microsoft Exchange\Org\Mailbox\Offline Address Book)
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xzay1967Author Commented:
Turns out it was a question of replication. Being it was a virtual environment, it took a loooooooooooooooong time for replication to take place.
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