Microsoft has completed the development of their fourth application for the iPhone.  It is now available on the App Store, so go check it out!  It is definitely a beautiful application that takes advantages of the form factor very well.  The new app includes support for the new Windows Live Messenger Wave 4 features.  This means you will have complete integration with Facebook, Flickr, and Skydrive files.

Windows Live Messenger is the most popular IM client in the world, so its move to the iPhone should be welcomed by many!  With the application, you can chat with all your Live Messenger contacts, as well as Yahoo! Contacts.

For those have been looking for an easy way to read your Hotmail on your iPhone, the wait is over.  You can now read your Hotmail right in the Windows Live Messenger application.

So there you have it.  You can now stay connected with nearly everyone via your iPhone!