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Group conversations are stored in the group's mailbox, separated from individual members' mailboxes. The messages in the group inbox are displayed in a list view, which includes members' photos to visually show the contributors to the conversation.
An Office 365 group is a space for team collaboration. It comes with a shared mailbox, calendar, library, OneNote notebook, and planning tool.
The majority of shared files for your groups are stored in a dedicated document library on OneDrive for Business, but you can also access additional shared and followed documents that you may need to further collaborate with your group.