Windows Live Messenger 8.5 Beta 2

Windows Live Messenger is the next-generation MSN Messenger. It has everything you already love about Messenger - your contact list, emoticons, and instant access to your friends via text, voice, and video - plus new ways to connect and share photos and documents effortlessly. It's faster than e-mail and is a great choice for conversations and the perfect alternative when you can't be there in person. As always, it's free to download Messenger and use most of its features.
Windows Live Messenger (WLM), still commonly referred to by the previous name of MSN Messenger (MSN for short), is an instant messaging client for Windows XP, Windows Server 2003, Windows Vista, and Windows Mobile, first released on December 13, 2005 by Microsoft. It is part of Microsoft's Windows Live set of online services.
Windows Live Messenger Features:
- Sharing folders
The Sharing Folder feature of Windows Live Messenger is an alternative to the "direct transfer" method of file distribution. When a user wants to deliver a file to another person on his or her contact list, the "sharing folder" window appears, which is an individualized representation of all previously shared items.
- PC-to-phone calls
In addition to PC-to-PC calls that have been supported in previous versions, Windows Live Messenger now supports PC-to-phone calls with Windows Live Call. In the US, this feature is supported by Verizon, branded as "Verizon Web Calling". Orange France also has a similar service. This feature is only available in selected countries, including the US, the UK, France, Germany, the Netherlands, Austria, Ireland, Finland, Belgium, Spain, and Italy.
- Windows Live Messenger to Yahoo!
This allows Yahoo! and Windows Live Messenger users to chat (using text or voice) to each other without the need to create an account on the other service, provided both contacts use the latest versions of the clients. However, if a user uses an older or third-party client, they will appear offline to the users on the other network.

you can download it from here
Windows Live Messenger 8.5 Beta 2

Windows Live Messenger 8.1.0178 Final