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!

Ta da! It’s the next-generation MSN Messenger. Along with everything you already love about Messenger—your contact list, emoticons, instant access to your friends—there are brilliant new ways to connect and share your photos (and other stuff). As always, Windows Live Messenger is free to download Messenger and use most of its features.