Introduction
Delegating permissions in Outlook allows you to grant another person access to manage aspects of your email and calendar on your behalf. With delegate access, you can control the level of permission granted to each delegate, from reading messages and responding to emails, to fully managing calendar events and meeting requests.
Procedure
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Click the File tab.
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Click Account Settings, and then click Delegate Access.

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Click the name of the delegate for whom you want to change permissions, and then click Permissions.
NOTE If you want to remove all Delegate Access permissions, do not click Permissions but instead click Remove and skip the remainder of these steps.
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The delegate permissions page will allow you to change access levels for several things, such as:
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Your calendar
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Your tasks
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Your inbox
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Your contacts
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Your notes
With each of these categories, you can individually assign the delegate to either have no permissions, be a reviewer (can read items), author (can read and create items), or editor (can read, create, and modify items).
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.
Note: If you want copies of meeting requests and responses that you receive to be sent to a delegate, make sure the delegate is assigned Editor (can read, create, and modify items) permission to your Calendar folder, and then select the Delegate receives copies of meeting-related messages sent to me check box.