Dngallagher wrote:
Macs will easily boot from pretty much any connected drive that has a bootable Apple OS on it - just select it at boot time till you want to change it - you can easily have Yosemite on an external and boot with it, or boot to Sierra on your internal.
You can also set up BOOTCAMP to run a dual partition - one for Mac and one for Windows almost automatically. That is rather drastic though in my opinion.
You can also use Parallels or VMWARE Fusion to set up a Virtual Machine to run under OS X fairly easily to run any number of operating systems under OS X, and for a no cost Virtual Experience, there is always Virtual Box, free for the downloading that will let you run Windows, Linux or a DOS operating system on your Mac within OS X.
I suspect that the larger issue with the OP is simply running older software on a newer OS - as security changes, as things change in the OS, as programming calls are no longer supported by the newer OS, older programs will cease to function in some or all ways. In my opinion, it is always best to remain current from the OS down to the main software in use - I update my OS as soon as it is available, never had any issues worth worrying about, I use software that is either free or on a subscription basis, so I keep the programs all updated as well - every update/upgrade.
When High Sierra is available for general use - Apple gives it away for free, and it will be on my Mac within a day or two. and I am confidant that my Adobe CC subscription will be ready when it is. EMail will be part of the OS, the Web browser will be part of the OS, LibreOffice will either work fine, or be updated for High Sierra - the remaining apps are just apps that get updated for the OS as well.
Macs will easily boot from pretty much any connect... (
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vm ware is the way to go with a windows computer. That being said it's still a hassle if you're not proficient using a windows enviroment. Try putting a mac operating system on a windows computer aka dual boot! It's hell.