Aqoliveira, it is unfair to put MS and Unix in the same bag.
Unix, contrarily to MS, is based on open standards building open systems.
It is true some implementations (note the plural) are proprietary, but everyone is free, and encouraged, to build compliant systems and to share Unix technology (but not source code I admit). For example, BSD, a legitimate Unix descendant, has never been known for its 'proprietaryness'.
In front of this, I doubt MS is encouraging anyone to develop compatible interoperating S/W or H/W, outside licensees.
Moreover, Gnu/Linux technical success is for a large part due to ideas borrowed from mainstream Unixes, so it is pointless to oppose them, Linux just would had never existed as it is, should Unix had not been invented.
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Linux on the other hand can run on various platforms ...
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There's nothing new here, one of the major innovation brought to the operating systems world by Unix was its portability, and this happened in the seventies. Linux was to born some 15 years later ...
Concerning H/W support, Solaris is supported on x86 processors since the beginning of its development (SunOS 5). Sun strategy for its low end systems is more based on its alliance with AMD (Solaris 10, AMD64 Opteron) than the proprietary Intel.