How to create and manage a shared group calendar in Outlook - Microsoft 365
1) At the top of the screen in Outlook, find the Groups tab and click New Group.

2) Enter the name of the new group and a description if desired. (An email address of the same name will also be created.)
3) Select a Privacy level (Private - for group members only or Public - for anyone).
4) Check the box to Send all group email and events to members' inboxes if desired.
5) Click Create.

6) One at a time, enter names or email addresses of users that you would like to add to the group. Added members will receive an email. Click Add Members once complete.

7) Once created, you will see the new Group in Outlook.

8) To edit the group membership, click on the group to select it and then look at the top of Outlook and click Group Settings --> Edit Group. Note - Owners can manage the Group, whereas Members can edit content.

9) Here you may manage group membership and settings.
