Yeah Linux is great in a lot of ways but life or death mission critical, kind of I guess. Tend to be more of an old school UNIX guy and so far been able to resist us moving from HP-UX (not one OS crash ever often with years of uptime, last downtime was moving from PA-RISC to Itanium hardware) to commodity Linux. As for the trusted extensions they are darn powerful but like any other hard core lock down RBAC they are a major PITA that admins and policy geeks love (not me) and users and everyone else hates (me). Thus the if my life depends on it qualifier. May also have gotten the down vote from a Xen fanboi.