I don't understand. There are lots of alternatives.
- Aix
- HP-UX
- Solaris
- Tru64
- MacOS X
- QNX
Or do you mean you don't pay for your OS?
- Aix
- HP-UX
- Solaris
- Tru64
- MacOS X
- QNX
Or do you mean you don't pay for your OS?
Linux distributions are not even UNIX, just UNIX compatible.
Linux mindshare is smaller that Microsoft mindshare, too
Depends on how you define "UNIX". If you define it as "Derived from the V6 codebase", then I'm pretty sure a number of the OSes you mentioned don't qualify. If you define it as "Legally able to use the trademark", then you miss a lot of OSes that work just fine with POSIX-compatible software, such as FreeBSD, and include z/OS, which is just perverse.