When I worked at DHS, I used to be an auditor who traveled to countless field offices of various DHS components who often had out of date equipment.
It was not out of the ordinary to see computers with Windows 95 still running in 2006.
My favorite was one office had it down to a science. Turn on the computer. Go talk to co-workers for 10minutes. Log-in to windows. Go get coffee for 10 minutes. And then he'd be up and running.