How are you trying to delete them now? Click once on the contact and hit the delete button on the keyboard? Are you syncing with MM or other computers?
There is no delete button, you just click the contact once and hit the delete key on your keyboard and the contact will be deleted. You can also select the contact, click Edit and then Delete Contact...Unless I am misunderstanding your question?
yes, how HOW HOW DO YOU DELETE ALL THE CONTACTS AT ONCE? NOT 1 BY 1 .
I was having the same problem. Some contacts had an active delete option in the menu, while others were greyed out. I finally went to the preferences and selected the Accounts feature. I noticed that Facebook was active on the account. When I deactivated Facebook, all the undeletable contacts disappeared and the remaining contacts were now deletable. Fiddle around with that and see what happens. I hope this helps.