Well... First of all: Welcome to the forums..
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Second:
The Messenger Plus! Api is nothing more than what you see in the Documentation and the Sources belonging to it.. There is nothing more nothing less...
The Messenger Api does still work with MSN 7, BUT, because the Api is from the "old days" using Windows Messenger and When MSN Messenger was version 5.0 the Api was fully useable... But today Micorsoft limits more and more of the Api each version they release... So many functions/calls in the Messenger Api does not work with MSN 7.0 but the basics of the Api does still work.. Eg: Getting Contacs, Groups, Block, Open Conversation etc. And also most if not all of the Trigered events will work like: OnSignIn, OnContactStatusChange etc....
But the basic note is that the Messenger Api DOES work with MSN 7, it's just relativly limited, and many of the features in the Api does NOT work...
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Hope this was explanation enough? If not just ask?
Third: No offence, but just checked your homepage..
.. Nice work... And it's really AMAZING to see a girl coding.. Not that i'm saying girls can't, but it is VERY rare you see girls code, and in particular made something big out of it, you got it all..
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Nice to see!.. And welcome onboard, hope you enjoy your stay..
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Edit:
BTW, What language you code in?...