6.8 years ..
I bet its not a windows based server 
Err, no.
That said, my brother had an NT4 server, on a private network, manage 5yrs uptime 
Many moons ago I had a 2K server (also running Exchange and a couple of other bits of mundane software) stuffed in the rack at Redbus for just under 4 years running 24/7 no problem. I still have the pics somewhere of the day I took it out of the rack after all that time running, and it was as spotlessly clean inside as the day I built it.
As far as Windows boxes being unreliable, they really only go wrong when the owner starts installing poorly written 3rd party crap.
Couldn't agree more, although MS have been known to push out the occasional product that crashes things - less so in the server arena though.
Windows Server has 2 problems:
It's the same (but tweaked) kernel as desktop OS, which means it gets targetted by baddies.
It's the same (but tweaked) kernel as desktop OS, so any Tom, Dick and Harry can write substandard software that will run on the server OS.
Its very, very rare to see a Windows Server fall over nowadays. TBH, not really since the days of NT 3.51 and NT4, although these were always as a result of duff drivers. In fact its rare to see any Windows machine fall over, if it does its usually a result of crappy unsigned, backstreet drivers, or failing hardware.
My day job is TSS for thousands of servers, covering mostly Windows, Linux, Solaris and a little HP-UX. Sticking with Windows for a moment, we tend to run this either directly on HP Proliant DL server hardware, or via a hypervisor running on HP Proliant BL blades. This combination tends to give us very, very few problems, as the hardware is pretty robust, the drivers are tried and tested, and Windows is rock stable.
We tend to run Linux on the same hardware, not as stable, partly due to less mature drivers available for Linux, made worse by a licencing problem if drivers taint the kernel (many do).
The machine in the original post was an elderly Sun Sunfire 280R, running Solaris 8. Shame Oracle (who bought Sun) can't make the current hardware reliable - I've spent all this week trying to build 5 Oracle blades across 3 chassis. 2 chassis had firmware issues that were not fixable by end user (ie, me) as Oracle don't make the firmwares available, 4 faulty blades, and now a faulty network module. FFS.