After the owner of the mailbox has added you as a member of a shared mailbox, close and then restart Outlook.
The shared mailbox should automatically display in your Folder pane in Outlook.
What if it didn't work?
If the owner only recently added you to a shared mailbox, it may take a few minutes before the shared mailbox appears. Wait a bit and then close and restart Outlook again.
Select the envelope\Mail in the bottom left of Outlook, then select the ... and then select folders. that will change the view in outlook
If that didn't work, then manually add the shared mailbox to Outlook:
Open Outlook.
Choose the File tab in the top left ribbon.
Choose Account Settings, then select Account Settings from the menu.
Select the Email tab.
Make sure the correct account is highlighted, then choose Change.
Choose More Settings > Advanced tab > Add.
Type the shared email address, such as CME.
Choose OK > OK.
Choose Next > Finish > Close.