Knock Knock

I don’t get the knock knock or door closing on Yahoo messenger anymore. I would like to know why?
I have Yahoo Messenger 10 and I use OS Windows 7 64-bit. Is it something that Yahoo Messenger 10 doesn’t use but does in the older versions? I’m curious to know why. I kind of miss hearing the knock knock when a contact comes online and the door closing when they go offline.
The newer versions of Messenger have new sounds. However you can get the old sounds back, I did. it’s also very easy to do. Just click this link from Yahoos help pages and it will tell you how to get the old sounds back, knock when someone signs in, door closing when they sign out, etc.
http://help.yahoo.com/l/us/yahoo/messenger/messenger10/messenger/mstaoldsounds.html
Mac Miller – Knock Knock