We are on a local domain, call it "L". Our mailboxes are on our mother company's exchange server in a different domain "M". The domains are trusted. Our L user accounts have rights to access our mailbox on the M domian exchange server (2003). So we log into our computer on local domain L and we can open our mailbox in Outlook with no extra authication needed. But we get the 0x8004010F error if we try to download the address book. NOTE: If we force Outlook to prompt for a user name and pw, and we log into Outlook using our M domain credentials, then the address book download does not fail. Is there any permissions we could set on domain M that would allow domain L user accounts to download the offline address book as explained above? Any help on this would be great ... Thanks!

OK, So you have two AD accounts for you, one in resource domain and another in child domain ??, Right.. if an administrator incorrectly configures users account problems downloading the OAB can start to happen. These problematic users are users that have two user accounts in the same AD forest, as you have pointed out above. •A disabled mailbox-enabled user account in the domain where Exchange was installed, and their enabled account in a different domain. •This enabled account was set as the Associated External Account on the disabled account. Under this condition if the user attempts to download the OAB a sync error will occur: Task 'Microsoft Exchange Server' reported error (0x8004010F) : 'The operation failed. An object could not be found.' How to Fix:: Disconnect the mailbox from the disabled account and connected it to the enabled account. http://blogs.msdn.com/b/dgoldman/archive/2007/04/19/downloading-the-oab-fails-with-0x8004010f-and-the-operation-failed-an-object-could-not-be-found.aspx Some more information :: http://blogs.msdn.com/b/dgoldman/archive/2008/10/01/understanding-why-error-code-0x8004010f-is-thrown-when-trying-to-download-an-oab.aspx http://blogs.technet.com/b/exchange/archive/2007/04/19/3401966.aspxAnil