popular back in the days when America Online's AIM Messenger was still a dominating force. Microsoft's MSN Messenger launched as an instant messenger (IM) program in 1999, built natively for the ...

including MSN Messenger, MSN Hotmail, and MSN Search, eventually replaced or renamed to Skype, Outlook, and Bing. In fact, most online Microsoft services from that era began life as an "MSN" product.