Windows Live Messenger v2011 (15.4.3538)

Windows Live Messenger makes it easier than ever to stay connected to the people you care about.

Favorites and groups - Put the people you chat with most at the top of your contacts, so you easily see when they're online. Want to chat with several people in one window? Just set up a group.
Share photos - Look at photos together, right in the conversation window. And Messenger tells you when people you know post new photos on Windows Live.
Customize - Show off your personal style with custom scenes, animated display pictures, and signature sounds.
Mobile and web - Using a public computer without Messenger? No problem! You can chat on the web from Windows Live Hotmail. Or, use Messenger on your mobile phone.

Get Messenger and stay in touch.

Download: Windows Live Messenger v2011 (15.4.3538) | 1.2 MB (Freeware, Web Installer)
View: Windows Messenger Website

The web installer also updates Windows Live Mail 2011 if you have it installed to v 2011 15.4.3538

Optional Add-on for Windows Live Messenger is A-Patch, which can be found here.

Changelog (1.43 build 17)

New: Added compatibility for Windows Live Messenger 2011 version 15.4.3538.0513

Feature: Remove advertisement from main window
Feature: Remove text advertisement in the IM window
Feature: Polygamy/Multi-MSN - open more than one Messenger at once
Feature: Remove the "See More Offerings" items in the file menus
Feature: Remove "Featured" section from the Emoticons "more" dialog box
Feature: Disable Nudge Shake (thanks digitaldj)
Feature: Remove Nudge Delay (thanks digitaldj)
Feature: Remove the top of the Contact List
Feature: Remove Search Bar.
Feature: Remove the "Connected to..." bar
Feature: Accept more than 3 files (transfers at a time) (thanks digitaldj)
Feature: Disable Photo Sharing (thanks Erazor)
Feature: Disable Video Sharing (thanks Erazor)

Note: To remove the image ad banner in the conversation window, untick the "Show expanded footer in conversation windows" option under the Tools > Options > Messages window in the Windows Live Messenger options.