Step 1 Login to your Columbia College 365 account and go to the 'Outlook' app. You can do this at http://www.office.com (or directly into your Outlook app at http://www.outlook.com).
Step 2 Select your initials (or picture) in the round icon in the top right corner then select Open another Mailbox.
Step 3 Enter the name, username or email address of the mailbox you want to access, select the account from the list provided and select Open.
Note: You have to have permission to view the shared mailbox in order for it to open.