I have an account in the old format and one in the new format. The new format is horrible when it comes to Contact functionality. I now have to export lists and remove contacts from other lists manually when, in the old format I could just choose a contact list and then choose to remove everyone in that list from any other list I chose. Why would they remove this function??? I see nothing in the new format that is better. Would prefer to have the option to stay with the old format.