There have been a number of instant messaging apps available for the iPhone which make it possible to chat with your contacts on MSN and other networks. Windows Live Messenger for iPhone is the official instant messaging client from Microsoft which also includes a number of social networking features.
As well as being able to see a list of your contacts and check their online status, you can engage in instant message conversations and access your Hotmail inbox. Email notifications are provided within the application so you can keep on top of your inbox without leaving the app.
You can also check the status updates of your friends on Windows live, Facebook, and MySpace and keep an eye on what your contacts are sharing on Flickr, YouTube and other social networks.
With the ability to upload photos you can share your experiences on the move, and keep in touch with your friends no matter where you are. With easy navigation between different aspect of the app, Windows Live Messenger is one of the most accomplished instant messaging tools available.
Note that this app is not an native iPad app.
A solid and reliable instant messaging tool from Microsoft which includes plenty of extra features.