My Desktop OS: OpenVMS with CDE (NewsForge)
Low cost: My desktop runs on the world's fastest workstation (as of 11 years ago). This investment, injected with a few expense dollars, has paid dividends 24x7 for years. Countless x86s and MIPSes have been come and gone, and the killer OS of the time was entombed long ago, yet critical software continues to run even on new hardware. Other OSes are camouflaged as backward-compatible, and porting existing software to these new versions is commonplace. OpenVMS's middle name is "backward compatible"; it continues to run the same 64-bit images that I compiled years ago."
