My company still runs a lot of stuff on AIX (also mainframes for that matter) and the reason is that it was set up that way in the 90s and no one feels like inv

My company still runs a lot of stuff on AIX (also mainframes for that matter) and the reason is that it was set up that way in the 90s and no one feels like investing the sizeable amount to move these business-critical applications over to Linux just for the sake of it. Unlike all the other unices that were formerly used here (HP UX, IRIX, Solaris, Super-UX and others) you can still get AIX support so there is nothing forcing the hand of this migration. I expect them to still run some stuff on AIX in 10 or 20 years. Nothing new will ever be deployed to AIX and probably hasn't been in 20 years. At some point the AIX systems will only be around for a handful of niche things and at that point the cost of migrating those over might become lower than the cost of paying IBM off.