B2 security.....which I strongly suspect VMS and Windows can't reach
Have a look at SeVMS. Whilst its B1 evaluated, moving to B2 is possible (The lock manager seems to me to be the most worrying communication channel but thats fixable)
A little info here and here (PDF)
Installing and running VMS is pretty easy and is near enough free, if you want any info email me (My username at gmail dot com).
Tandem is part of Compaq, now HP.
Have a look at SeVMS. Whilst its B1 evaluated, moving to B2 is possible (The lock manager seems to me to be the most worrying communication channel but thats fixable) A little info here and here (PDF)