I am experiencing the following error message when trying to add/remove/modify delegate rights.
"Cannot activate send-on-behalf-of list. You do not have sufficient permission to perform this operation on this object." It occurs on mailboxes migrated from Exchange 2003 to Exchange 2010. We originally discovered it when creating profiles for resource mailboxes and attempting to modify their delegates while logged in under our own credentials with Full Access to the resource mailbox. The program did not occur when opening our own mailboxes and modifying our own delegates, however we are now finding users who cannot modify even their own delegate rights. Additionally the options underneath the delegate rights are also grayed out for these users. We have attempted adding the Write Exchange Personal Information permission to the SELF account on the mailboxes as suggested in some Exchange 2007 guides online, but this has not resolved the issue. Anyone else running into this and have a resolution? Brad
