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So short disclaimer I work for HP but
Realize that HP is really several companies.
The stuff you buy in Best Buy etc is from PSG and yes they are very Microsoft centric.
However ESSN (Enterprise Servers, Storage and Networks) is very multiplatform. There is a huge internal use of Linux and Windows, Linux is a first class citizen on all of our servers Itanium and x86-64. That includes support for RHEL, SLES, OEL, even Debian. Solaris is supported on our x86-64 gear additionally and is quickly reaching parity with Linux and Windows. HP doesn't just prefer Windows heck we are allowed to run Linux on our work desktops versus Windows when we don't have a business need to run Windows for a specific application.
The Itanium really has a sorted past with HP because toward the end of DEC's life Intel and DEC got into a patent dispute etc and Intel ended up buying most of the Alpha tech and manufacturing from DEC hence VMS and Tru64 and Non-Stop went to Itanium. HP-UX went Itanium because HP couldn't afford to maintain PA-RISC anymore.
Realize from an HP perspective Itanium runs every OS they sell and there a features that are absolutely critical to how Non-Stop works. Now granted Itanium seems a bit neglected compared to x86-64 but it really is the only chip that can run everything.
The folks I feel sorry for are user of MPE! A bit like AS/400, factory-floor reliability. HP is suffocating the OS.
A special day was Fiorina, at her first HP World user conference, asking, "What's MPE?"
I figured HP was done around '94 when they blessed NT over HP-UX, and HP-UX has moved slowly ever since. At least AIX treats the sysadmin as educable; HP seems to think the sysadmin can do nothing without a menu.
OpenVMS for x86 already exists. It is called Windows (from 2000 to 2008 and 7, based on NT).
The NT kernel was almost a clone of VMS, made by the same designer Dave Cutler
Just because there are similarities does not make Windows OpenVMS. Just because they are designed by the same guy does not make Windows OpenVMS.
By your criteria, OS X, Linux and Minix are all AIX, because they use the similar designs, and philosophies.