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MSN Messenger is an instant messaging client for Windows and Mac OS computers (officially, but can be run on virtually any computer with an Internet connection, see Third-party clients), aimed mainly at home users. The business oriented client, which also uses Microsoft's .NET Messenger Service is called Windows Messenger.
Users require a Microsoft Passport to connect to the service. The major use of the software is for instant messaging. Messages can be enlived with graphical emoticons.
Other features which now come as standard include voice conversations, support for webcams, transferring files and built in multi-user games such as patience.
Version 6 emphasized the ability to customise the software, with personalised backgrounds, emoticons and display pictures. There is also a large community of third-party developers who have created addons to extend the capabilities of the program. The most recent version, as of 2004, is version 6.2.
In August 2004 MSN introduced a browser-based version of the MSN Messenger client which can be used on any computer that can access the internet.