How can I talk to someone who is on MSN messenger without using MSN messenger?

Friday, September 3rd, 2010 at 3:15 am

So I use MSN messenger, and I don’t want to download any other messengers onto my computer. But my Mom uses AIM and Yahoo I think, I know there’s a site you can use to talk to people on different messengers at once but I have no clue what it is. Could you please tell me what site it is?