Roll back from OS X Mavericks ( or any newer OS) to Mountain Lion on new MacPro

I need to know if it is possible to back rev or roll back on the new MacPro or iMac?
Working with video production applications (Avid) would like to get new hardware platform and that would require Montain Lion for the short term with the intention of moving back to Mavericks assuming that is also possible with the same licesense?
Final question does anybody know if there are issues with Thunderbolt through this roll back process?

If a Mac ships with a new OS shortly after its release, it is sometimes possible for it to boot with the previous OS; however, if the Mac has new hardware, it likely has a special build of the new OS to take advantage of the new hardware and it will not boot with the older OS.
Sorry I cannot provide specifics. You'll have to find someone who has done it (or tried).

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