As of today, when I delete a message by clicking on the "X" button, the part of the window that shows the message disappears ... and the message is not deleted.
From the list of replies, I can't delete replies, either.
Using Opera 9.50.
Difference in opinions hath cost many millions of lives: for instance, whether flesh be bread, or bread be flesh; whether whistling be a vice or a virtue; whether it be better to kiss a post, or throw it into the fire... (from Gulliver's Travels)