Question : Exchange RUS in Co-exhistance producing 8270 Error

I am currently migrating two domains from an exchange 2003 environment to 2007

the exchange 2003 system sits in a child domain along with all of the production users. i am installing exhcange 2007 into the root domain.
Users in the root domain are not being updated by the 2003 recipient update policy, and i am contunually recieving error messages from the RUS service on
on the 2003 system saying that the server does not have LDAP permissions over the user object in the root domain.
i have read around the usual forums and found that alot of these issues are to do with permissions not inheriting from the above containers in ADSI edit.
this however is not the issue as i have checked the effective permissions on the user objects on the root domain, and all exchange servers in the child domain
have the correct permissions to the user objects.

furthermore i am recieving error messages when creating new mailboxes on the root domain 2007 system.

'The Exchange server address list service failed to respond. This could be because of an address list or email address policy configuration error.'

Im sure that these two issues are the same.

Thanks in advance for any advice

Answer : Exchange RUS in Co-exhistance producing 8270 Error

Just a quick note to round this one off.

eventually i stumbled upon this post from MSEXCHANGETEAM which answered the issue

http://msexchangeteam.com/archive/2007/03/12/436983.aspx

Thanks