Add mailbox to Outlook (Windows)
Posted by , Last modified by Jorge Rodriguez on April 14, 2022 01:41 PM

Several users have access to multiple email addresses, often shared with other employees in the same department. Examples of this include; and Even if you have access to these addresses, the mailbox still needs to be added to Outlook on your computer for you to interact with that email address. The following are instructions that will show you how to add these mailboxes.

Step 1: Click "File" at the top-left corner in your Outlook window.

Click "Account Settings", to make a drop-down with several different options appear. Of these, click "Account Settings...".

In the "Account Settings" window that pops up, click "Change...". Make sure you have selected (clicked on) the email address that has access to the mailbox you would like to open.

Click "More Settings" in the bottom-left corner of the "Exchange Account Settings" window.

Click "Advanced".

Click "Add...".

Enter the full email address of the email you would like to open, then click "OK".

Verify that your mailbox name shows up under "Open these additional mailboxes:", then, click "Apply". After this, close out of every window except for the main Outlook window, or restart Outlook.

Verify the mailbox is added below your normal email addresses. You should be able to click the arrow to the left of the name, and your various folders like the Inbox should appear. If you do not actually have access to the mailbox, or entered the address incorrectly, it will not actually open anything, which is what is shown in the following image. I do not have access to use the mailbox, so it merely adds the name to my Outlook application, without letting me actually use the mailbox.

You have now successfully added your mailbox to your Outlook application. For any further assistance regarding Outlook mailboxes, feel free to submit a support request at

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