Some users will have access to shared/departmental mailboxes, however these mailboxes sometimes will required to be added manually to your outlook account. to do this please follow the below steps.
* Note permissions must have been granted by the IT team before access will be granted, if you require permission please raise a Service Request using the flowing link: Add/Remove Group Member
Outlook 2013/2016:-
- Click the File tab > Account Settings > Account Settings.
- Select your M2 email address in the account list.
- Click Change > More Settings > Advanced tab > Add.
- Enter the shared email address name and click OK.
- Click Apply > OK > Next > Finish.
- The shared mailbox will now automatically display in your Folder pane in Outlook