- Open Outlook > Tools.
- Under Tools choose Accounts.
- The Accounts dialog box will open.
- Click on Advance > Delegates.
- From the Delegates screen choose the plus sign under the “Open these additional mailboxes.”
- Type the name of the mailbox you like to add, select the mailbox from the list and choose Add. Click OK.
- Close the Accounts box.
- The mailbox will display on the left side of Outlook.
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