pop3 webmail open source

I am serching "pop3 webmail open source" which i can use it as a outlook.
I have searched sourceforge.net and many other sites for the pop3 webmail open source but could not
got the exact I want.could any body help me out of this problem..
Help expected
PANKAJsearch msdn.microsoft.com

there sample on there that has full code for running pop3 / smtp
i've got the source on my computer somewhere, but you may want to go to microsoft anyway to see if there are any updates, etc.