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I agree. I don't buy upgrade to PD 10 for a Yosemite support ! And the renew speed cycle let think when Windows 9 come out , we need buy PD 11 :)
Now , i know why Parallels don't upgrade PD9 for Yosemite Guest support ! 50 €uro for upgrade 9 to 10 .... hmmmm i prefer buy a VMWare licence...
Sorry for my english... Same for me . After buy Parallels 5 then upgrade to 6 , 7 , 8 and 9 ... i stop all with this "Yosemite frustration...