Remove a Security Group or Distribution List
You must use an account that is in the Domain Admins group to perform this procedure.
To remove a security group or distribution list
Click Start, click All Programs, click Windows Essential Business Server, and then click Windows Essential Business Server Administration Console.
Click the Users and Groups tab, and then click Group Management.
Click a group, and then in the tasks pane, click Remove group.
In the Remove Group dialog box, click Yes.