Did you add the exchange 2007 server as a replica to the public folder versions of the OAB?
I'm betting not... From: Brad Metzler [mailto:bmetz...@cu-portland.edu] Sent: Thursday, January 14, 2010 1:04 PM To: MS-Exchange Admin Issues Subject: Evil OAB message 0x8004010F We have a 2 server Exchange 2003 environment where we have added an Exchange 2007 server which we are now attempting to migrate users to. However, all the users migrated to Exchange 2007 get an error when attempting to download the address book under Send/Receive: "Task 'Microsoft Exchange' report error (0x8004010F) : 'The operation failed. An object cannot be found.'" After going through many articles via Google, I'm not seeing a clear answer to this one. We moved our OAB generation from the 2003 server to the 2007 server and added publishing it to the web OAB directory as well (it was already set to publish to the public folders). The clients on the 2003 server can still download the OAB just fine, but even after 24 hours the error persists on the people who have been moved to the 2007 server. Anyone have a magic bullet or some good suggestions on things to check on this one? Thanks Brad