As per Microsoft: "This event is logged when the Recipient Update Service cannot stamp Exchange attributes on Active Directory objects. When this event is being logged, users may not appear in the Global Address List (GAL). Additionally, users may not be able to access their Exchange mailboxes. These GAL display problems and mailbox access problems may occur if an internal class incorrectly processes certain threads that run at the same time". See MSEX2K3DB
for more details.
From a newsgroup post: "My guess is that there are bugs in the Recipient Update Service, that manifest this error when rapid changes are made to a user’s AD attributes. Probably these changes are being made across the RUS update cycle and the attributes get out of sync. After looking at MS KB ME821908
, I noticed that some administrator accounts had the “showInAddressBook” attribute out of sync with AD U&C. These were mailboxes that I had toggled the checkbox off and on a few times. Then I did the following:
1) Removed the "Hide From Exchange Address List" attribute of an administrator account that I had previously set.
2) Changed the update interval of "The Recipient Update Service" (which of course is not a real service and thus causes the entire MS SA and IS to have to be restarted) to be only every 4 hours.
3) Restarted SA/Exchange for the settings to take effect.
I then was able to enable the “Hide” function in AD Users & Computers for my account, manually run the Recipient Update Service, and have everything work properly without an error".
Several users stated that installing the Exchange 2003 Service Pack 1 solved this problem for them. From a newsgroup post: "Prior to installing Exchange 2003 SP1, you will need to install hotfix ME831464
. Then after installing Exchange 2003 SP1 install ME843539
to get OWA back to where you should; you just need to enter in your username/password for OWA instead of domain\username".