Windows: Windows XP, 128MB of RAM
Mac: Miro is compiled as a Universal Binary for the Mac, thus supporting both Intel and PowerPC processors. Miro 5.0.1 is the last version that will offer support for PPC.
Mac OS X 10.5 or higher and QuickTime version 7 (which you should be able to get through Software Update)
Linux: 500Mhz CPU with a good video card, 1GHz without, 128MB RAM
Miro does not run on Android or iOS.