no it will still be read by the person it has been sent to...i accidentally deleted a message mrs c had sent,but the person it was sent to still got it.....
This occurred to me recently as well.
And also, maybe a Mod could answer this........
if I sent a PM on Friday / Saturday when there was the server probs, is it likely it wouldn't have been received?
I too wish we could delete/edit the PM if it is marked as unread.
Also another little 'gripe' is that if you save your sent messages and some of them are marked unread, once you click save everything is marked as read. This includes received PM's aswell. You then have no idea what you have read and what you haven't.