Question : want to create exchange mail box on child domain hosted by parent domain mail server.

Just created a child domain and now I want to create exchange mail accounts in the child domain.  I created one which is hosted on an exchange server on the parent domain.

i dont see that new child domain email account.  am i missing something?

Answer : want to create exchange mail box on child domain hosted by parent domain mail server.

Hello Touly,

In addition to running domainprep in the child domain, you will have to create a Domain RUS for child domain in order to have Exchange Mailboxes for users in child domain.

I hope following information may help you to resolve the issue:

SYMPTOMS
When Microsoft Exchange 2000 Server or Microsoft Exchange Server 2003 is installed, two Recipient Update Services (RUS) are created, one for the Enterprise Configuration and another for the domain. The domain Recipient Update Service only processes objects in the Windows domain where Exchange was installed. When you create a user in a remote Windows domain, the Recipient Update Service does not process that account.

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CAUSE
A Recipient Update Service is not automatically created for a remote or child Windows domain. This causes the Recipient Update Service to not be able to process any mailbox-enabled users or mail-enabled users in the remote or child Windows domain.

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RESOLUTION
To resolve this issue, first run Exchange Setup with the /domainprep switch on a server in the remote Windows domain. Then, on your Exchange server use the Exchange System Manager to create a Recipient Update Service for the remote domain. To do this, follow these steps:
1.      Click Start, click Programs, click Microsoft Exchange, and then click System Manager.
2.      Expand the Organization object, and then expand the Recipients container.
3.      Click Recipient Update Service.
4.      In the right pane, right-click New, and then click Recipient Update Service.
5.      Click the domain that does not have an instance of the Recipient Update service and that has users that must be updated by Exchange.
6.      Click Next.
7.      Choose the server that you want to run the Recipient Update Service and process all the necessary users with the Exchange attributes.
8.      Click Next.
9.      Click Finish.
10.      To manually initiate an update of the recipients in that domain, right-click the Recipient Update Service, and then click Update Now to force an update.

Please refer to KB 275294 -  http://support.microsoft.com/kb/275294

Regards,

Kaushal