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The instant messaging capability is constistent with other Microsoft products, and it is easy to get started and start talking. All of the functionality of OCS and Windows Live Messenger is installed, without the pointless winks or Flash animations that get in the way, but does include things like a whiteboard, emoticons and file sharing.
Instant messaging is - well, instant, as you can see on Zack's screen.
You can send and receive files, documents and attachments, just as you would be able to do in any other instant messenger.