Windows Live Messenger is Microsoft’s fourth (free) application for the iOS platform and was first shown at The Next Web conference earlier this year.
The iOS app brings the new Windows Live Messenger Wave 4 features with it. Integration with Facebook, Flickr, Skydrive and other services. Some screenshots:
The chat feature allows you to interact with both Windows Live and Y! Messenger contacts. As shown in the demo the photos you share will be uplaoded to Skydrive.