its not my 'job job' so to say, but i work for IBM, via windows 2003/2008 server platform because i've used those systems for many years business n personal use they wanted someone to know it a lot (when the other guy left) and they didn't really wanns change to Server 2012 (not in our department anyway lol)

Also manage several linux distros old ones, - but the oldest system i have to keep an eye on is a windows server under Windows N.T 4.0 (which is buried in the server room behind several other servers)


I've also looked at IBM's Unix platform which is know as 'System Z' but that is beyond me.... don't know it at all lol and im not allowed in that room where it is ha... lol