ok, I have a parent domain and a child omain. The exchange server is in the parent domain and I'm having trouble mail enabling the child domain users. I've run domainprep in the child domain and created an RUS on the exchange server pointing to the child domain. However If I create a child dc user and add a mailbox the mailbox never appears on the exchange server. I'm also unable to login to the account via OWA or outlook. The user property page does show the correct email address. If I send a mail to the account I get a NDR saying the account doesn't exist. I followed this technet article( http://msexchangeteam.com/archive/2004/07/07/175444.aspx ) to check the RUS is checking for changes and it does seem to look ok. I've also followedf this one ( http://support.microsoft.com/kb/275294 )but none of the suggested event IDs show in my application log. Am I barking up the wrong tree??

Mailboxes do not appear in ESM (presuming this is Exchange 2003) until the mailbox is used for the first time. Therefore if you waiting for it to appear, you are going to be out of luck. Does the account get an email address automatically? It should get two - an SMTP and a X.400 address. If that isn't happening, then RUS isn't working correctly. Until the accounts get those addresses, you cannot use them. Simon. Simon Butler, Exchange MVP. http://blog.sembee.co.uk , http://exbpa.com/

Yes the accounts do get both the smtp and x400 addresses. I've checked the RUS is running and all looks well.I can see the event logg picing up new accounts and changes made to objects in the child domain, as shown in the technet article above. I can't even login using outlook, the username doesn't resolve. I've tried username, domain\username, childomain\username. Nothing works.

Ignoring Outlook, do these users appear in the GAL? If they have their email addresses, then they are stamped by Exchange, so they should be mail enabled. Have you tried OWA? This could be an authentication issue. Run the Exchange Best Practises tool from Microsoft against the environment and see if it flags anything of interest. Simon.Simon Butler, Exchange MVP. http://blog.sembee.co.uk , http://exbpa.com/

ok, I've just got back to the office, here's the situation as it stands. I can create mail enabled users from the child dc but they aren't getting their smyp addresses or showing up in the GAL, there's no mailbox either as I can't login. RUS seems to be working in that I can see 8011 events on the exchange server that match up with changes made on the child domain. However these changes don't actually seem to be put into place. So, looking at the 2080 events I can see that the chidc does not have permissions to read the nTecurity Descriptor as per MS article 316300. This article reccommends I re run domain prep but as I said before domain prep is failing with the error code 0xC0070560. This error code seesm to be soething to do with the permissions of the exchange enterprise servers grI assume it's talking about the parent domain version of this group? Thanks