Originally Posted by DanTravels
Up to OS 9, yes, but not so much anymore. Since the advent of OS X, Microsoft's Office products for the Mac have included Entourage, a Mac-specific program similar but not identical to Outlook.
Your Google-to-iCal method might work better, though - I haven't tried.
The stock mac calendar works fine with iCal files. Download it and it should open in your default calendar system.