Finally someone starts trashing NT4, because it really deserves it.
If you Internet explorer, notepad and word, then you can use almost any os (except windows 1.0, etc).
The saddest thing about IRIX and Solaris, is that the hardware required to run it cost $$$£££€€€.
But then again, sun makes laptops, ranging from 120000 SEK ( 8.1 SEK = 1 $ ) and up.
And we're talking SCSI and no crap here.
Wonder if it even has the option of running on battery.
