Msn-API:http://msdn.microsoft.com/library/default.asp?url=/library/en-us/winmessenger/winmessenger/overview/devtest.asp
http://www.xihsolutions.net/dotmsn/download.htmlhttp://www.hypothetic.org/docs/msn/forum.php
http://zhouwran.spaces.live.com/blog/cns!F815C2377431BB22!201.entrymsn login process:http://searchsecurity.techtarget.com.cn/tips/37/2367037.shtml
msn protocol:http://msnpiki.msnfanatic.com/index.php/Main_Page
use dotnet to develop msn Robort:http://www.im286.com/archiver/tid-1267660.html