Welcome Rolanda-90,
thanks for your interest in Vienna MIR.
MIR as we know it now won't ever be available for Mac. But don't despair: Based on the same concept, we are working on a new application called Vienna MIR Pro right now, which will bring OS X-compatibility (amongst many other new features). We can't announce its release date officially yet, but we have high hopes to have MIR Pro ready during winter 2010/2011.
In the meantime, you could use MIR on a Mac like quite a few fellow users do it: You could run Windows 7 on any up-to-date Intel-Mac using BootCamp. Or you could use MIR like it was actually meant to be used: As a stand-alone application on a dedicated PC, receiving MIDI from your Mac. :-)
Kind regards,
/Dietz - Vienna Symphonic Library