Respond to meeting requests for another person
Action
To respond to meeting invitations for a person you are set as a delegate for, follow the steps below.
Instructions
Delegates receive invitations
When a manager selects the Send meeting requests and responses only to my delegates, not to me check box on the Delegates tab (Tools menu, Options command), the delegate is granted sufficient permissions to accept meeting requests for the manager directly in the invitation that they receive.
Delegates do not receive invitations
However, if the Send meeting requests and responses only to my delegates, not to me check box is not selected, a delegate must have both Editor (can read, create, and modify items) permissions in a manager's Calendar folder and at least Reviewer (can read items) permissions in the manager's Inbox.
Open the other person's Inbox if his or her meeting requests are not sent to you directly.
Open the meeting request.
    3. Click Accept, Tentative, or Decline.