In a fit of extreme solutions, you could try deleting the email account it came in on, then re add it after it goes away. Have you tried a soft boot or battery pull lately?
Open messages/menu/options/message display and actions, scroll down to actions and make sure the "confirm delete" box is unchecked. They should go away when highlighted by pressing the "del" key without confirmation popup. Hope this works for you.
Have you tried to delete it by DM.
Just connect your BB to DM. Then select Device-->Delete data(select the items you want to delete) --> Select "YES".
I think this trick may help.
Have you tried to delete it by DM.
Just connect your BB to DM. Then select Device-->Delete data(select the items you want to delete) --> Select "YES".
I think this trick may help.