Hi, Check it's OAB. Where is it getting the AL from? Is from a list in the "Global Address Lists" or a list in "Addres Lists"? It should be from the AL not GAL. Check permissions of the list too. Best regards Mike > We deployed Exchange 2003 on both Front-End and Back-End. Back-End > Exchange is our mailbox und OAB server. We hosts some customer mail > domains. Each customer has its own OABs, GALs, etc. One mail domain has > synchronisation problem with Exchnage server. The Outlook 2003 client of > this domain get error when they send/receive messages: > > "The Microsoft Exchange server reported error (0x8004010F): The operation > failed, an object could not be found." > > How can we fix this problem? Is it an access problem of Exchange > Enterprise Servers or OAB rebuilding problem? Thanks in advance.