Open Outlook
From the menu, click File, then the +Add Account button
Type in the e-mail address of the shared mailbox and click Connect
Important: Do NOT enter a password, instead click Sign in with another account
Delete the prefilled e-mail address and enter your WWU e-mail address and click Next
Enter your WWU e-mail password and click Sign in
Click Done, then restart Outlook to see the shared mailbox
Open a Shared Mailbox in Outlook Web
Login to WWU Office 365 mail
Click your account icon in the upper-right corner and select Open another mailbox
Enter the e-mail address of the shared mailbox in the search, select the mailbox, and click the Open button