Archive — These messages will be retained indefinitely.
Delete — These messages will be retained for 30 days, after which time they will be permanently deleted and unrecoverable.
If you are a group admin for a group, you can delete that group. Network admins can delete any group they are a member of. Verified admins can delete any group.
Q. Is there any way to retrieve deleted data after a group has been deleted?
A. Check with the person in your business who has admin permissions. In a large business, this is the internal help desk / technical support. Depending on the data retention policies your verified admin set for your Yammer network deleted Yammer data may still be available in data exports.
If the deleted group was a Microsoft 365 connected Yammer group, the Microsoft 365 resources will be available for 30 days. For more information, see Restore a deleted Microsoft 365 Group.