This article describes how to add someone else's mailbox to your existing Outlook profile connected to Exchange mailbox.

You need to have appropriate permissions to the mailbox in order to be able to add it.

Read the Knowledge Base articles for your version of Exchange for more information: How Do I Enable Send As Or Full Access Permissions On An Exchange Account?

Note: The mailbox you are adding should not be hidden from the Global Address List (GAL).

Outlook 2010/2013/2016
Outlook 2011/2016 for Mac
Outlook 2007

In Outlook 2010/2013/2016:

In Outlook 2011/2016 for Mac:

 

In Outlook 2007:

  1. On the Tools menu, click Account Settings.
  2. Select and double-click the email account you would like to change.
  3. Click More Settings.
  4. Select the Advanced tab.
  5. Click Add to open another mailbox.
  6. In the Add Mailbox box, type the name of the mailbox owner.
  7. Click OK twice.

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