Shoutbox

Well,
If I have a POP3 E-mail property set or the registry key modified in Plus!, when I click on the "xxx new messages" link in the contact list (id est messenger main window), Plus! opens the assign URL or the assigned program, right?
But if I use my keyboard to make the link focused and press Enter, still windows' default mail program (for me it's Hotmail and it can be set in Internet Options\Programs) is launched.
I think this should be fixed...anyone?