OpenVMS is considered a highly secure and reliable operating system relied upon by large enterprises around the globe such as Stock Exchanges, Governments and Infrastructure for critical operations.
It is supposedly the most secure system in the world.
As well as many small & medium businesses that continue to run it on HP Integrity/Itanium boxes.
You've got to be kidding. Check the graph.
I'm not kidding. This graphs is a classical example of data falsification. Solaris is actually a pair of quite distinct OS-es: the classic big-endian SPARC one and the newfangled little-endian on x86/x64. They have significantly different security profiles.