Currently, my Help Desk group has Exchange Read Only permissions, which
gives them the ability to manage mailboxes. They now require the ability to
give another user the ability to access someone else's mailbox (for
instance, an assistant needs access to the boss' mailbox). When the Help
Desk person tries to grant mailbox permissions to the mailbox, they get a
"Catastrophic Failure" error since they don't have permissions to grant
What permissions do I need to grant to the Help Desk so that they can
perform this task? Thanks.