Now Im almost sure that RUS is responsible for this. The Recipient Update Service (RUS) is a very important component in your Exchange installation, it is RUS that is responsible for updating address lists and email addresses in your Active Directory, RUS takes it’s time to update all the information in AD, so give it some time and everything will appear.
How to ensure that the RUS is running correctly and some issue with using RUS in a multiple domain environment.
By default your organization will have two RUS objects. The “Enterprise Configuration” Recipient Update Service is responsible for the updating of the email addresses for the system objects such as the Message Transfer Agent (MTA) and System Attendant.
The “Domain” Recipient Update Service is responsible for the updating of the address information for recipient objects in the domain. that it is responsible for.
To adjust the properties for the Recipient Update Service, right click over the service and then select Properties, the properties for the Recipient Update Service will now be displayed
It is possible to force the Recipient Update Service to start processing, you have two options “Update Now” or “Rebuild”, and both of these options are available by r