Outlook - Access a Shared Mailbox

Outlook Online

Temporary Access Method

Sign in to your mailbox at https://outlook.office.com
Click your name at the top-right of the screen and select Open another mailbox.
Enter the address of the mailbox you are wanting to open.
The mailbox will open in a new tab.

Permanent Access

Sign in to your mailbox at https://outlook.office.com
In the left folder pane, right-click on the word Folders and select Add shared folder.
Enter the address of the mailbox you are wanting to open.
The mailbox will appear in the left folders pane. You may need to scroll down to make it visible.

Legacy Outlook Desktop App (Windows)

Mailboxes that have been shared with you should automatically appear in your folders pane within 1-2 hours.

New Outlook Desktop App (Windows)

Mailboxes that have been shared with you should automatically appear in the left folders pane under Shared with me. If you do not see an account that has been shared with you:

In the left folder pane, click the ellipses (...) next to your primary email account or right-click on your primary email account name and select Add shared folder or mailbox.
Enter the address of the mailbox you are wanting to open.
The mailbox will appear in the left folders pane. You may need to scroll down to make it visible.

Outlook Desktop App (Mac)

On the Tools menu, click Accounts.
Click the Plus Sign to add an additional Exchange account.
In the E-mail address field, enter the email address of the shared mailbox.
Under Authentication, enter your own credentials.

Checking the setting Sync shared mailbox will allow Outlook to synchronize the shared mailbox without requiring the user to click Send/Recieve.

Outlook Mobile App

Tap the Add account button in the left navigation pane, then tap Add a Shared Mailbox (Android - tap the top left menu button to see the Add account button)
If you have multiple account in Outlook Mobile, select the account that has permission to access the shared mailbox.

After the account setup process completes, the shared mailbox will display in your account list.