Today marks the Exchange mailbox migration to Office 365 for the DIVISION OF HEALTH SCIENCES for more information and some troubleshooting tips please go to this link.
Since course groups are no longer available you might want to try using Teams. Microsoft Teams is a hub for collaboration allowing you to interact, share content and collaborate in a single location. Teams offers a desktop app and can also be accessed anywhere through Office 365.
Contact this office for assistance and or more information.