You do not need to register "Messenger Plus!" to have copyright on it, just by releasing the product you have that, you only need to register to have it as a trade mark.
Either way, it is illegal for someone to knowingly copy your program name, although copying the ideas and implementation is completely legal unless you get patents (at £1000's) on it.
Sadly, in reality, you (and anyone else) will never make enough money to challenge anyone in any court in America, for anything, without bankrupting yourself.
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