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Add a shared mailbox to Outlook
Open the Outlook app on your laptop/computer. (NOTE: You'll notice that there are two different types of Outlook Applications, one is called classic, the other is called new. In this case we are wanting to open the New one.)
On the left side of the screen, right-click Shared With Me in the folder list, and select Add shared folder or mailbox. Alternatively, you can click the three dots to the right of Shared With Me.

In the Add shared folder or mailbox dialog box, type the email address or name of the shared mailbox and click Add.
The mailbox should now appear in your folder list.
Find the shared mailbox in the folder pane
In the folder pane on the left, locate the Shared with Me folder. Click it to expand it. Your shared mailbox is a subfolder under Shared with Me. When you select the name of the shared mailbox there, it will expand to show the standard email folders, such as Inbox, Drafts, and Sent Items.
Send mail from the shared mailbox
- Open new Outlook for Windows.
- On the Home tab, select New > Mail.
- If you don't see the From field at the top of your message (next to Send), on the Options tab, select Show From.
- Click From in the message, and change to the shared email address. If you don't see your shared email address, choose Other email address and then type in the shared email address.
- Finish typing your message, then choose Send.
From now on when you want to send a message from your shared mailbox, the address will be available in your From drop down list. Whenever you send a message from your shared mailbox, your recipients will only see the shared email address in the message.
Reply to mail sent to the shared mailbox
- Open new Outlook for Windows.
- Open the email message you want to reply to.
- In the From field at the top of your message, you should see the name of your shared mailbox. If you don't, choose the From dropdown box and choose your shared mailbox.
- Finish typing your message, then choose Send.
When you want to send a message from your shared mailbox, the address will be available in your From drop down list. Whenever you send a message from your shared mailbox, your recipients will only see the shared email address in the message.