okay, seems the solution for connection was Server
Admin->Mail->Settings->Advanced->IMAP and POP SSL: switch from "Don't
Use" to "Use". now I can log in, and see my mail.
NOW the trouble is, when I *send* mail from there? it is trying to
load /webmail/src/compose.php and i get THIS...
Action Canceled.
Internet Explorer was unable to link to the Web page you requested.
blaa blaa blaa.