Shoutbox

Yeah i have noticed something somewhat similar to this. A family friend who uses messenger (who I am 100% sure does not have stuffplug, let alone Plus!) is on my MSN. On a few occations, the window has popped up signifying that they have opened a conversation with me when they are offline.

I am assuming that I am not blocked because i sometimes see this contact online, instead, I think this is occuring while the contact is Appear offline. I dont know if or how this is related to blocking a person but it can fit in above.