Messenger Discovery Live
Windows Live Messenger is definitely the most used messaging program out there but there are some functions that are either not supported or that are limited.
There are plenty of plug-ins out there that will make using Messenger a more pleasing experience. One of the most popular is Messenger Discovery Live, which allows you to do everything from seeing which users have blocked you (that's kind of naughty, actually!), add animated avatars and various sound effects, which is especially popular with the teen set. There are also options for increasing security and managing your contacts.
Messenger Discovery Live is only compatible with Windows Live Messenger.
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