Can an older OS be installed on a brand new MacBook?

We are getting a brand new MacBook Air for the office, but we are afraid that the new OS won't allow perfect compatibility with the older Macs in the office. Not wanting to update all the old Macs, we would rather install the older OS on the new one. Can this be done?

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No they are not backward degradable. Look for used or refurb'd machines at Apple that come with a warranty and will run the OS you require.

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Thank you for your quick reply Machead3. But, just to be clear: What if we completely wiped the new computer clear, and re-installed the older OS? Is that an option, or will the new computer not be able to allow the old OS?

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The problem is the "older system" might not have the needed extensions (aka drivers) for new hardware like CPU's and GPU's, wireless etc. Also the OS architecture may not work with the CPU/RAM. (This results in kernel panic failure). You can also have a bit of forward compatibility issues in that old hardware is not up to fully using the new OS. Example: Some folks have tried putting in bluetooth 4.0 in older boxes in order to to get access to handoff in Yosemite. . . only to find out that the OS wouldn't work the way it does on new boxes.

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I have never seen an Apple product that would load an operating system lower than what it shipped with. To find out what it shipped with go to Everymac and look the machine up and it will tell you what it shipped with and the maximum operating system it will take: http://www.everymac.com

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Thanks for your time/answer, mayer!

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As machead and mayer say, every Mac OS/iOS device has a software floor - it won't run an operating system that's older than the hardware itself.

But let's step back for a moment, and look at the trigger for your desire: What are you doing with your current computers such that you think a new computer with a new OS won't be "perfectly compatible"? What computers are you using now, and what operating system are they running? What does "perfectly compatible" mean in your situation?

A new computer with a new OS will connect to your network, share files with your existing computers, and use the networked printers you already own. Are there specific applications that you're worried about? If you have a particular application that won't run under OSX 10.10, you can run an older operating system (OSX, Windows, Linux, Solaris) as an application on top of OSX by using emulator software such as Parallels, VMWare Fusion or VirtualBox. The primary intention of these products is to run Windows applications on Mac (or older versions of Windows on newer versions), but you can also run versions of OSX as old as 10.6 on Macintosh hardware that otherwise wouldn't support them. Running OSX 10.6 requires 10.6 Server (available for $19.99 only by phoning Apple's sales number at 1-800-MY-APPLE); running OSX 10.7-10.9 can be done by using the setup wizards in the virtualization software.

Once you've installed a virtualized OS, you then install the applications you need inside the virtualized environment. 10.6 Server/.7/.8/.9 behave as if the main operating system doesn't exist.

This isn't how you'd want to work all day, but for older applications that you don't use all the time it can be a very effective technique. There's a slight speed hit from the extra layer of software; but since it's running on faster hardware to begin with, it's usually a wash.

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Jeff will be eternally grateful.
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