Does anyone know if Apple plans to support AirPlay Mirroring in Macs older than last year? It seems in the fine print that it only works with 2011 models.
closed as not constructive by Simon Sheehan, Daniel Beck♦ Jul 28 '12 at 7:49
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It seems unlikely that AirPlay Mirroring will be coming to older Macs. It has been reported that AirPlay Mirroring requires hardware H.264 compression support from the GPU, to compress your screen image small enough, fast enough, to pipe it across the network.
It does seem unlikely.
According to 9to5Mac,
After reading the link in the previous answer I doubt AirPlay Mirroring will come to before-2011 Macs. It's the same issue with iOS devices: