Comment by tcmart14

I think if Apple was seriously eyeing a server market, Linux would not be the target OS. Apple already relies on quiet a bit from the BSD sphere, I think it would be more likely they have an internal port of FreeBSD or NetBSD. The advantage here is, it would already share some common traits with MacOS and because of licensing, Apple can rebrand it and make modifications without opening the source. Apple has done this before as their Apple AirPorts way back when ran a version of NetBSD.