Can we remove a delegate from a user's account on the Exchange 2003 server, instead of going through the Delegates tab in that user's Outlook?

Not that I know of, have to do via Outlook.Sukh

publicDelegates - This attribute stores the user that was configured as a delegate (the secretary). publicDelegatesBL - This attribute stores the user his mailbox that was configured with a delegate (the manager) you can view and edit these attributes by using ADSIedit.msc and navigating to the following path: 1. Domain partition. 2. The relevant domain (for example DC=ms,DC=com). 3. The relevant location of the user that you are looking for (for example CN=Users). 4. Choose the relevant user, right-click > properties. 5. Look for the relevant attribute (for example publicDelegates). http://www.petri.co.il/finding_delegates_in_active_directory.htmPlease remember to click Mark as Answer on the post that helps you, and to click Unmark as Answer if a marked post does not actually answer your question. This can be beneficial to other community members reading the thread.

publicDelegates - This attribute stores the user that was configured as a delegate (the secretary). publicDelegatesBL - This attribute stores the user his mailbox that was configured with a delegate (the manager) you can view and edit these attributes by using ADSIedit.msc and navigating to the following path: 1. Domain partition. 2. The relevant domain (for example DC=ms,DC=com). 3. The relevant location of the user that you are looking for (for example CN=Users). 4. Choose the relevant user, right-click > properties. 5. Look for the relevant attribute (for example publicDelegates). http://www.petri.co.il/finding_delegates_in_active_directory.htmPlease remember to click Mark as Answer on the post that helps you, and to click Unmark as Answer if a marked post does not actually answer your question. This can be beneficial to other community members reading the thread.