This is Windows Live Messenger version 2009 aka Windows Live Messenger 9, the latest version of Windows Live Messenger from Microsoft. WLM, right now, is in beta stage, so ONLY beta testers will be able to sign in!
Today, shortly after 0 AM, the latest Windows Live Messenger Build has been leaked. This Build features WPF effects and has a well designed User Interface
Install Instuctions:
Download, unpack, launch either the live insaller or just launch the messenger.msi
Download: Windows Live Messenger 9 (Build 14.0.3921.717) | Mirror | Mirror
Download: 去广告、多开补丁