Messenger Plus! is not compatible with Windows Live Messenger because it isn't a public release.
Matty's reply to Windows Live Messenger 8 and Messenger Plus!
Original Thread
quote:
Originally posted by Patchou
As for when the next version of Messenger Plus! will be available, well, let's just say it's a secret for now but I promise you will not be disappointed. I will not release any version to support private beta versions of the new Windows Live Messenger (formerly known as MSN Messenger 8) but I guarantee that you will like what you'll see next year when it goes public. I'll keep you posted 
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