https://tools.ietf.org/html/draft-movva-msn-messenger-protocol-00 https://tools.ietf.org/html/draft-movva-msn-messenger-protoc... MSN Messenger's protocol was

https://tools.ietf.org/html/draft-movva-msn-messenger-protocol-00 https://tools.ietf.org/html/draft-movva-msn-messenger-protoc... MSN Messenger's protocol was submitted to the ECMA in 1999, but MS made changes to their implementation almost immediately that were never documented.