This feature requires you to use a Microsoft Exchange account. Most home and personal accounts do not use Exchange.
Just as you might have an assistant who helps you manage your incoming paper mail, Microsoft Outlook provides similar functionality by making it possible for you to give another person access to your Inbox and any other Outlook folder you want. The process of granting someone permission to open your folders, read and create items, and respond to requests for you is called delegate (delegate: Someone granted permission to open another person's folders, create items, and respond to requests for that person. The person granting delegate permission determines the folders the delegate can access and the changes the delegate can make.) access.
As the person granting permission, you determine the level of access the delegate has. You can give a delegate permission to read items in your folders, or to read, create, modify, and delete items. You can give a delegate permission to send mail and to respond to mail on your behalf. The delegate can also organize meetings on your behalf and respond to meeting requests and task requests sent to you. By default, if you grant someone access to your folders, that delegate has access to the items in the folders, except items marked private. You must grant additional permissions to allow access to private items.
Note If you want to use the Delegate Access feature, your mail must be delivered to your mailbox (mailbox: Location on a Microsoft Exchange server where your e-mail is delivered. Your administrator sets up a mailbox for each user. If you designate a personal folder file as your e-mail delivery location, messages are routed to it from your mailbox.) on the server, not to a personal folders file on your hard disk.