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Linux has an easy to install port (http://zfsonlinux.org/). I remember OSX as having to use it via FUSE. I guess that leaves only Windows.

OS/2 had installable filesystems. Does Windows have something like it?

I didn't mean like ZFS, but like installable filesystems. It should be possible, with some effort, make ZFS run on Windows.

ReFS is beta-quality and lack several features ZFS has since its first production-grade release. It's not really an apples to apples comparison.