Q: So if my iMac is more than 12 months old I can no longer use AirPlay?  This is ridiculous!!!  Do I have to go back to snow leopard to have the use of what I pay for?

I "upgraded" to Mountain Lion and lost the Airplay function.  My computer - iMac 2010 - is apparently to 'old' for this.  

There must be a work around or the staff at Apple is not nearly as sensible as I thought.