If a notification group is no longer required by processing
rules, you can delete it. If you delete a notification group used
within a processing rule, the notifications will not occur.
To delete a notification group:
Expand Microsoft Operations Manager (default) in the
left pane.
Expand Rules in the left pane.
Expand Notification Groups in the left pane.
Click the notification group in the right pane that you want to
delete.