Delegate problem with meeting requests

Description: A user complains that when sending a meeting request in Outlook to a coworker, several others also get that same meeting request that shouldn't get it.

Cause: This is caused by delegate rights in Outlook / AD

Solution: Check Outlook's delegate settings of the receiver of the meeting request. When adding a delegate in Outlook, there is a checkbox which is checked by default (easy to miss) saying that it shall give a copy of meeting requests to that delegate. (see pic above).

OBS! Deleting delegates in AD under Exchange General > Delivery Options > Send on Behalf doesn't remove them from user's Outlook. However the reverse order does remove them from AD.