qbit, Haiku is not officially supported by Parallels Desktop 4.0. Though if someone will find a way to run it, it will be nice to find out how he did it. Qbit, feel free to create thread in Feature Suggestions forum http://forum.parallels.com/forumdisplay.php?f=28 or submit a ticket with feature request https://www.parallels.com/support/desktop/request/ and Parallels team will consider implementing support of this OS.
here there is the thread: <http://forum.parallels.com/showthread.php?t=13431> I've now recreated a new installation in Parallels 4 and it works well, with the caveat we posted in that thread. regards salvo