How to connect to a shared mailbox

There are 2 ways to connect to a shared mailbox:

The web version of Outlook is best for occasional need to view the messages in that mailbox.
If you would like to monitor it more frequently, then add that mailbox to the full Outlook desktop application.

How to connect to a shared mailbox through the web version of Outlook (for occasional use):

Log into the web interface of Outlook: http://portal.office.com/
1. Format your username like: NetID@colostate.edu (Replace NetID with your CSU NetID)
2. You’ll likely need to enter your CSU password and accept a DUO 2-factor prompt
Click in the left pane to open Outlook
Click on your picture/initials in the top right corner
Click ‘Open another mailbox’
Type in the display name of the shared mailbox, i.e., VPR Shared Mailbox (replace with the name of the mailbox)

How to connect to a shared mailbox in Outlook (for frequent use):

Click on the File menu in the top left of Outlook.
Click on the Account Settings button.
Click on the Account Settings… option within the drop down menu.
Under the E-mail tab, click New...
Type in the email address of the shared mailbox. For example, if the shared mailbox name is: VPR Shared Mailbox, then the email address will be: VPR_Shared_Mailbox@colostate.edu (replace spaces with underscores).
Click the Connect button.
Wait while Outlook attempts to resolve the resource mailbox email address, this can take up to 5 minutes.
If this step fails to find the shared mailbox, try again but format the email address like: VPR_Shared_Mailbox@mail.colostate.edu (add @mail. to it).
When prompted for a password, click the ‘Sign in with another account’ text link.
Delete the shared mailbox email address and type in your NetID@colostate.edu (Replace NetID with your CSU NetID).
Click the Next button.
Type in your NetID password.
Click the Sign in button.
When prompted for a password the second time, click the ‘Sign in with another account’ text link.
Now your name and NetID should be displayed, click on it to pick that account.
Wait for Outlook to add the shared mailbox account.
Uncheck the ‘Set up Outlook Mobile on my phone, too’ box.
Click the Done button.
Click the Close button.
Close Outlook, leave it closed for 10-15 seconds.
Open Outlook, it will start setting up the new mailbox.
Wait for Outlook to bring down a copy of the shared mailbox contents, it can take a couple of hours to sync the entire mailbox depending on how many messages are in it.