MSN Messenger SDK?

Hello,
Some time ago I saw the MSN Messenger SDK in the microsot site, but now that I've got some interest in it, I can't find it!
All I can find is the Windows Messenger 4.7 API but I don't want it, what I want is the MSN one, anybody know where I can get it now?
Thanks.

I think it might be the .NET Service Kit or something gay, I'll check.

k, I'm pretty sure that all you use is that API, version 4.7. The MSN SDK was mostly OOP anyways, so this API makes a little more sense.

Ok, I'll download that and see what I can make out of it. I'll try to work out what can be used with all versions and what can't.
Thanks
EDIT:
I've just found out from www.mess.be that the Windows Messenger API works better with Messenger 6 than Messenger 5 so it's good news for me :D !