You also understand that by temporarily accessing your msn account, TST Management, Inc. is NOT agreeing to MSN’s terms of use and therefore not bound by them.

Uhm, yeah. That makes a whole lotta sense, see? We screw the terms, which is why we are not bound to them, which is why we can screw them. Simple!

More about that scam can be found on this blog post – there is probably more out there, but that’s the first post I found, and is fairly complete about the matter. Basically it’s simple:

Don’t give your username and password to any other app than your messenger. And if you did, change the password.