RE: Does MP! uses messenger's API or its a hacking?
Whether it's possible for skype or not, I don't know. However, I can pretty much guarantee that it won't get "ported" to skype, because there's only one developer. It's hard enough for Patchou to take care of Plus! for WLM, I don't think he has time to do it for every other program (because if he does it for skype, people will want it for AIM, Yahoo Messenger, and etc.). Thus, no, you probably won't get it for skype.
The future holds bright things in it\\\'s path, but only time will tell what they are and where they come from.
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