A delegate automatically receives Send on Behalf permissions. By default, the delegate can read only the meeting requests and responses sent to the manager. The delegate does not have access to read any other messages in your Inbox.
Click the File tab.
Click Account Settings, and then click Delegate Access.
I don't see the Add button
The Add button might not be visible because of one or more of the following:
An active connection does not exist between Outlook and Exchange. The Outlook status bar should display Connected to Microsoft Exchange or Online.
Your messages are not being delivered to your Exchange mailbox. Your e-mail must be delivered to your Exchange mailbox, not to an Outlook Data File (.pst) on your computer hard disk.
Type the name of the person whom you want to designate as your delegate, or search for and then click the name in the search results list.
NOTE: The delegate must be a person in your organization's Exchange Global Address List.
Click Add, and then click OK.
In the Delegate Permissions dialog box, you can accept the default permission settings or select custom access levels for Exchange folders.
If a delegate needs permission to work only with meeting requests and responses, the default permission settings, including Delegate receives copies of meeting-related messages sent to me, are sufficient. You can leave the Inbox permission setting at None. Meeting requests and responses will go directly to the delegate's Inbox.
NOTE: By default, the delegate is granted Editor (can read, create, and modify items) permission to your Calendar folder. When the delegate responds to a meeting on your behalf, it is automatically added to your Calendar folder.
To send a message to notify the delegate of the changed permissions, select the Automatically send a message to delegate summarizing these permissions check box.
If you want, select the Delegate can see my private items check box.