In the practice of Apple obsolete products are those that were discontinued more than seven years ago. So far Apple has discontinued all hardware service for obsolete products with no exceptions. Looking this thread: http://forums.macrumors.com/showthread.php?t=1877381 i am wondering if a Mac Pro 2009 upgraded to firmware 5,1 will be obsolete next year, meaning a new OS X 10.12 at the end of 2016 cannot not be installed without any hacks? An upgraded Mac Pro 2009 shows in 'About this Mac' the year 2009, with regard to the serial number of the Mac. But if you look at 'further informations' you'll see modell-identification 'MacPro5,1', with regard to the upgraded Boot-ROM version MP51.007F.B03 Does anyone know if the OS X Installer checks the serial number or the Boot-ROM version? If it's checking the Boot-ROM version, further OS X upgrades will be no problem for the next 3-4 years, like the Mac Pro 2012 modells, i hope.