Accessing Shared Mailboxes from the Outlook Web Client
Open https://outlook.office.com and login with your DWER credentials.
Click on ‘My Account’ which is in top right-hand corner. It will appear as your O365 picture or your initials (as below).
Select ‘Open another mailbox’ from the drop-down menu.
Type in the name of the mailbox you wish to add, select it and click open.
A pop up will appear.
Enter the name of the shared mailbox you wish to view and select ‘Open’.
If you have permission for the selected mailbox it will appear in a new tab.
You now can perform activities in the mailbox and calendar as the shared mailbox.