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

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.

From that article:

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

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.