Become a MacRumors Supporter for $50/year with no ads, ability to filter front page stories, and private forums.
Why isn't the Mac Pro range prefix available in this forum?

I think it's because the powers that be want Mac Pro discussion in the Mac Pro forum:

WildCowboy said:
Mac Pro models from this time period should, however, be discussed in our Mac Pro forum.
 
Its usage is quite limited with Mac OS, since the latest MacOS you can install in El Capitan (pikified).
For Linux OS => I haven' tried Linux
Windows: I've installed and run Windows 10 64bit (with some tricks). Not really tried any software yet.
 
Register on MacRumors! This sidebar will go away, and you'll see fewer ads.