- You have two Active Directory sites on a slow network in a Microsoft Exchange Server 2010 organization.
- You have an Exchange Server 2010 Client Access server and an Exchange Server 2010 Mailbox server in one Active Directory site.
- You have an Exchange Server 2010 Client Access server and add an Office Outlook user in the other Active Directory site.
- The user whose mailbox is located in the different Active Directory site tries to download the Exchange Offline Address Book (OAB).
Note After you apply the update rollup, the Autodiscover service refers the Outlook user to the closest (local) Client Access server. However, if the user never retrieves a service connection point (SCP) object to the local Client Access server, or the local Client Access server does not have a copy of the user's OAB, the user downloads the OAB from the Client Access server in the same site where the Mailbox server is located. Additionally, the user can potentially download the OAB from a much farther site. Therefore, make sure that the appropriate SCP objects are set up, and that Active Directory sites are designated appropriately.