Yeah but they tried NT on other platforms but for the most part they weren't mainstream nor were they major breadwinners and some if not most, failed, the line I am talking about is the 3 - 95 - 98 - 2000 - XP - Vista - 7 - 8 - 10, the FRANCHISE OS, the ones that made the money.Well, I was kinda focusing on the past 10 years, also regardless of those processor changes you mentioned, the classic Mac OS never changed, it was still the same Mac OS from 1984 to 2001.
Also, please note that Microsoft has never been with one chip the whole time, so I guess that's not in your memory bank. Windows NT was originally designed as a portable operating system. Version 3.1 to 4.0 supported MIPS, Alpha and PowerPC. Some Windows 2000 editions such as Datacenter and Advanced Server supported Itanium, along with XP and Server 2003 supporting Itanium on the desktop and server. These were limited to expensive workstations and high end servers. Also, Itanium support continued until Windows Server 2008.
We are all aware of Windows RT which itself flopped because of a lack of desktop apps.
Even though many of these processor technologies became defunct, the fact is, it was part of the Windows family at some point or another. Windows 10 and Server 2016 which are the current client and server versions can trace their lineages back these variants.
In fact, when Dave Cutler started work on NT, he intentionally did not target x86 to avoid being pulled into the architecture and purposely compiled and self hosted Windows NT initially on MIPS then compiled for other platforms.
I mean Apple had other projects such as A/UX and even AIX, Mac OS Server 1.0, etc, but these were not the Major Line or "Flagship OSes", I mean there are side projects that fail. But I am talking about the major mac line that was actually USED by CONSUMERS, in the millions, not a couple IT guys beta testing Server Hardware in the back...
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Oh I know, it's going to be rough...Right, Apple's worried about the financial's of the developers. Please, they're concerned with getting a 30% cut with EVERYTHING that gets put on an Apple device. I'll NEVER buy a device that can only run applications in a sandboxed environment. Fine for my phone/tablet, but not my workhorse. I don't know anyone that's fine with buying a all terrain vehicle, but then only being able to take it on manufacturer approved terrain. Makes sense for a rMB/Air sized device, but what's the point of doing that for a Pro machine. Pro users need to be able to customize their platform before anything else.