In new Outlook for Windows, only group owners can delete a Microsoft 365 Group or remove members from it. The delete option is available on the Edit Group screen, not directly on the message list.
To delete a Microsoft 365 Group (work or school account, new Outlook):
- Open new Outlook.
- In the left pane, either:
- Select Groups in the app bar, or
- In the mailbox folder list, select Go to Groups.
- From the Groups list, select the group.
- Select Edit Group next to the group’s name.
- On the Edit Group screen, choose Delete group.
- This deletes the group and all its inbox content and related data.
- A deleted group can be restored for up to 30 days. See Manage expiring Groups in Outlook in the linked documentation.
To remove a contact/member from a Microsoft 365 Group:
- Follow steps 1–4 above to open Edit Group.
- Select the Members tab.
- Remove the member from the list (or change their status/ownership as needed).
For Outlook.com personal Microsoft 365 Groups:
- Sign in to Outlook.com.
- Select Groups in the app bar.
- From the ribbon, select Edit Group.
- From there you can edit the group’s Photo, Name, Email address, or Description, then Save.
- To delete the group entirely, use Delete group from the same Edit Group screen.
If the delete option is not visible, the account likely is not an owner of that group; only owners can edit or delete groups.
References: