Hmmm... that would be something worth testing out, I bet you could use
Display Picture Changer to constantly change your pictures, to see if any of your blocked contact's messenger picks anything up, but I'm not sure if it will work. But if the person that has blocked you has also deleted you, then im pretty sure that it wont have any affect, but you can check if they deleted you by going into WLM options--then the privacy tab, then click to view who has you added to their list.
Also, odds are, if they deleted you, they most likely have blocked you also.
OK, I did some tests, and after a countless number times changing my display picture, it hasnt popped up saying that the blocked contact opened my window
Maybe there is another way i can try to make a connection from my computer to theirs, I did notice that when i changed my display name, it changed on the blocked contacts list also, but the notifier did nothing. If i talked to the contact that had me blocked, nothing.
But once when i talked to the contact that had me blocked, the message went through! And my display picture changed on their list! How bizzare is that! There has to be some sort of loop-hole to see if someone blocked you, we just have to find it.
Also, if they have one of your display picture cached onto their computer, and you change your DP to match the ones already on their computer, your display picture will change on their list, but the notifier doesnt do anything, but if you change your display picture to a picture that their messenger dont have in its cache, it will not download the picture from your computer to theirs. But at the same time, if you have a picture that they dont have, and they open your window, the notifier will pick that up. But if you have the same picture up as they have on their list, and they open your window, nothing happens.
Also, if they opened my convo window, and the Notifier picked that up, then what kind of connection is going through, and what kind of information is it sending? This is definatly something to look into.
I performed this test by using 2 different computers, and using 2 of my MSN accounts, and blocked one of them, in case your wondering.