it was actually the *most* widely used real Unix at one (very dark) point.

justin66 · on March 10, 2016

Interesting thought. I have no problem believing it was running on the largest number of CPUs. I wonder if it had the largest number of users.

criddell · on March 10, 2016

From that article:

"according to AT&T, roughly half of the 500,000 Unix licenses are held by Xenix developers"

justin66 · on March 10, 2016

As I alluded, it's a question of what you're measuring. CPUs, developers, and users could all vary between versions.

I really am amazed by that figure, though. Wow. And I had forgotten that xenix ran on some bigger machines, not just pcs.