If you are using new outlook:
1. Click the settings wheel in the top right
2. Choose Accounts > Your accounts
3. Click the Add account button
4. Input the email address you'd like to add, and finish any sign-in steps
5. The mailbox will appear in bold on the left pane.
If you are using classic outlook:
1. With Outlook open, click on File
2. On the Account Information page
a. Select Account Settings
3. On the Account Settings tab
a. Click Change
4. Under Server Settings
a. Click More Settings
5. Under Microsoft Exchange
a. Click the Advanced tab
6. Under Mailboxes
a. Add
7. Under Add mailbox
a. Type in name of email account you want to add
b. Click OK
8. If more than one potential match is found
a. Select the correct account
b. Click OK
9. At the bottom under the Advanced tab
a. Click Apply
b. Click OK
10. Under Server Settings
a. Click Next
11. Under Change Account
a. Click Finish
12. Under Email Accounts
a. Click Close
14. You will see the new mailbox in the left pane