from the mirc faq
6-3 Is there a version for Windows CE, WebTV, Mac or Linux?
No, sorry. mIRC just comes in two tastes for Windows; a 16 bit and a 32 bit one. These issues will work on Windows 3.x, Windows 95, 98, 2000, ME, XP, and NT, but not on Windows CE. mIRC also does not work on the Atari, Commodore, WebTV, Macintosh, UNIX or Linux operating systems. We have no plans to make mIRC versions for these systems in the future either. Sorry....