I'm running WS2003with Exchange 2003 SP2. The exchange server is the first installation on a new box. I have first batch of users (around 10) migrated onto the box and their mailboxes all setup and are working fine. Allowing a day for those to settle down and make sure their mailboxes were working fine, I then went to add the next set of users. In Active Directory when I add a mailbox to a user the mailbox is created, but when you then click on the properties for the user and look at the Exchange Email Addresses tab it is blank! There are no email addresses defined. When I created the first set the correct email address had been pre-populated and where necessary I manually adjusted it. Now I get nothing. I've entered the correct SMTP addresses manually in to the tab, this is accepted and stored in Active Directory, but when I then go to Outlook and try to configure that users account it fails on 'Check Name' to find the account. Can anyone help? I can provide further details if more are needed. Many thanks.

Cannot create correct email address is look like RUS issue,please reference this article :Exchange Recipient Update Service does not stamp proxy addresses in Exchange 2000 Server and in Exchange Server 2003 ,my experience is just restart MSExchangeSA service. After finished email address issue,you should can logon this mailbox.If still not,see this KB link Troubleshooting Check Name errors .

Thanks for the info will try today.

Dear Djseven Well, the same problem happened to me, whenever I create a user account in ADS, right after clicking the properties, I could not find the Email address of the user account. As a solution what I did is , just to refrest or restart ADS, In this way, for every user you created recently, you can see the Email. No need to put it manually. I It will be there automatically. One thing more in order to ensure that the Mailbox for the user has been created or not, just see Right click user, go to Exchange Tasks, If there is an option that "Create mailbox" then it means there mAILBOX is not created for the user althoug the useraccount is created. What you need to do in that case is to create mailbox manually using this wizard. Still if you need any help, let me know Regards