To delete all Contact Groups:
1. Click the drop-down arrow at the top left of your navigation location next to the word "Mail".
2. Select the Contacts link.
3. Check the checkboxes next to Only the Group Names you want to be deleted from your contacts.
4. Click the Delete button.
Note: Once you click Delete, all the Groups selected will be deleted from your Contacts. There is no checkbox to select all group contacts.