Re: Netware? Less than 20 years ago? Where was he working - Jurassic Park?
In 2006 I was using a DOS laptop to talk to a PLC, as the software wouldn't run on anything newer. (Could have used DOSBox, but didn't find that out until later.) Right now I'm working with tape drives connected to HP-UX machines, which are production-critical for the biggest product of an international >$1B/year company.
Don't worry, they know about the epoch deadline and are planning on upgrading sometime before then.
(Anon for very obvious reasons.)