Create a group in Outlook - Office Support
https://support.microsoft.com/en-us/office/create-a-group-in-outlook-04d0c9cf-6864-423c-a380-4fa858f27102
In the Groups header, tap +. On the New Group page, type a name for the group > Next. On the Settings page, enter the required information, including privacy level, (Public or Private), classification, and whether group members should follow group conversations and events in their personal inboxes. Tap Create.
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