I haven't had any of my Macs crash in about 2 or 3 years. Only downtime, is if power goes off, and the UPS doesn't last that long. I have an old PC I got from work when laid off. I run dead simple win98 on it, and it does what I would ever need it to; run a few win only programs, like some Jepp stuff. It does require a restart at least once a day though if trying to use it for much of anything else. Found that in real use, that is pretty normal of M$ systems, but home users may not see that always until installing extra junk. That's the big advantage of anything unix based, be it BeOS, Linux, MacOSX, Solaris, etc., as they are built to be stable.
Be is gone, but the system still hangs around. Kinda like Amiga does.
http://www.bebits.com/whatisbeos if anyone wants to still play around with it.