username password prompt after suceesful mailbox migration

We have a root domain\child domain setup.
The root domain contains exchange 2003, the child domain contains an exchange 2007. Exchange 2007 has successfully installed. We are in the process of migrating the mailboxes to to the child domain (exchange 2007) from the root domain. The user accounts for the time being are going to stay in the root domain. The mailboxes suceesfully migrate, however when the user tries to access the mailbox he/she is prompted for an username\password. If I add the user to the domain admin groupmof the parent domain the user can access the mailbox okay. I feel that the issue is AD rather than Exchange. Can anyone enlighten as to where and what permission i need to allow the user to access the mailbox on the child domain without granting them admin status.
ExcitechSupportAsked:
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jtarabayCommented:
In AD, look at the properties of a user account, and click Exchange Advanced.  Click mailbox rights, does the user have permissions to this mailbox? Usually you'll see the user "Self" in there, make sure it has proper permissions, usually all the check boxes for "Self" are checked.
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ExcitechSupportAuthor Commented:
Yes Self has full mailbox access, i feel that the problem is more associated with the user accessing the server on the child domain rather than the mailbox.
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ExcitechSupportAuthor Commented:
Awarding 500 points for answer!
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florin_sCommented:
as I understand you have made a migration, this means that you do not have exchange 2003 in your organisation, if not you have made a transition did you follow these steps or something like this:

http://www.msexchange.org/tutorials/Transitioning-Exchange-2000-2003-Exchange-Server-2007-Part1.html

this is a 3 part article about transitioning from 2003 to 2007
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ExcitechSupportAuthor Commented:
Yes, this was the procedure followed but we have not yet decommissioned the exchange 2003 server.
The exchange 2003 is in the root domain, the exchange 2007 in the child domain. we are gradually migrating the accounts from the root to the child, that is not the problem, we need for a short time to keep some accounts in the root, if we move the mailbox to the child (no problems here), the user (account in the root) is prompted for username password, this can be resolved but the user in the domain admin group but for obvious reason I do not want to allow this. What i need to know is how to allow the root accounts access their mailboxes on a exchange 2007 server on a child domain? i am sure this an AD security issue rather than an exchange issue.
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JoWickermanCommented:
Hi ExcitechSupport,

Adjust Security permissions to allow "Authenticated Users"  to Access this computer from the Network.

Cheers
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