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

Posted on 2011-10-11
Last Modified: 2012-05-12
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.


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
Question by:xzay1967
    LVL 26

    Expert Comment

    Just a quick question:
    GAB --> Global address book, correct?

    > When we have the Outlook in Online mode and we have all the names appearing in the GAL?
    if yes, then should we concentrate @ the OAB issue?

    Author Comment

    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.
    LVL 12

    Assisted Solution

    OK, it appears you have a problem with your Offline Address Book. Can you run Get-OfflineAddressBook | fl and paste the output here, please.
    LVL 26

    Accepted Solution

    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)

    Author Closing Comment

    Turns out it was a question of replication. Being it was a virtual environment, it took a loooooooooooooooong time for replication to take place.

    Write Comment

    Please enter a first name

    Please enter a last name

    We will never share this with anyone.

    Featured Post

    Looking for New Ways to Advertise?

    Engage with tech pros in our community with native advertising, as a Vendor Expert, and more.

    Set OWA language and time zone in Exchange for individuals, all users or per database.
    ADCs have gained traction within the last decade, largely due to increased demand for legacy load balancing appliances to handle more advanced application delivery requirements and improve application performance.
    In this video we show how to create an Address List in Exchange 2013. We show this process by using the Exchange Admin Center. Log into Exchange Admin Center.: First we need to log into the Exchange Admin Center. Navigate to the Organization >> Ad…
    The video tutorial explains the basics of the Exchange server Database Availability groups. The components of this video include: 1. Automatic Failover 2. Failover Clustering 3. Active Manager

    761 members asked questions and received personalized solutions in the past 7 days.

    Join the community of 500,000 technology professionals and ask your questions.

    Join & Ask a Question

    Need Help in Real-Time?

    Connect with top rated Experts

    8 Experts available now in Live!

    Get 1:1 Help Now