Note: the delegate must be using Exchange for this to work.

From the Tools menu, select Options then the Delegates tab.

Delegates Tab

Choosing the delegate

Granting Permissions

Sending meeting requests & responses

You can choose whether a delegate has access to your private items, and also whether a mail should be sent informing him/her about his permissions. After the delegate has permissions, you can choose to send meeting requests and responses to the delegate only.